51660155 has 4 divisors (see below), whose sum is σ = 61992192. Its totient is φ = 41328120.

The previous prime is 51660137. The next prime is 51660173. The reversal of 51660155 is 55106615.

51660155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51660137) and next prime (51660173).

It is not a de Polignac number, because 51660155 - 2¹⁴ = 51643771 is a prime.

It is a super-2 number, since 2×51660155² = 5337543229248050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5166011 + ... + 5166020.

It is an arithmetic number, because the mean of its divisors is an integer number (15498048).

Almost surely, 2^51660155 is an apocalyptic number.

51660155 is a deficient number, since it is larger than the sum of its proper divisors (10332037).

51660155 is a wasteful number, since it uses less digits than its factorization.

51660155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10332036.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51660155 is about 7187.4999130435. The cubic root of 51660155 is about 372.4362126711.

It can be divided in two parts, 51660 and 155, that added together give a palindrome (51815).

The spelling of 51660155 in words is "fifty-one million, six hundred sixty thousand, one hundred fifty-five".