61551655 has 8 divisors (see below), whose sum is σ = 80576784. Its totient is φ = 44764800.

The previous prime is 61551653. The next prime is 61551661. The reversal of 61551655 is 55615516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61551655 - 2¹ = 61551653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61551655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61551653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559506 + ... + 559615.

It is an arithmetic number, because the mean of its divisors is an integer number (10072098).

Almost surely, 2^61551655 is an apocalyptic number.

61551655 is a deficient number, since it is larger than the sum of its proper divisors (19025129).

61551655 is a wasteful number, since it uses less digits than its factorization.

61551655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119137.

The product of its digits is 22500, while the sum is 34.

The square root of 61551655 is about 7845.4862819331. The cubic root of 61551655 is about 394.8328192803.

The spelling of 61551655 in words is "sixty-one million, five hundred fifty-one thousand, six hundred fifty-five".