1655887551 has 4 divisors (see below), whose sum is σ = 2207850072. Its totient is φ = 1103925032.

The previous prime is 1655887481. The next prime is 1655887591. The reversal of 1655887551 is 1557885561.

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

It is a cyclic number.

It is not a de Polignac number, because 1655887551 - 2⁹ = 1655887039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1655887494 and 1655887503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655887591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275981256 + ... + 275981261.

It is an arithmetic number, because the mean of its divisors is an integer number (551962518).

Almost surely, 2^1655887551 is an apocalyptic number.

1655887551 is a deficient number, since it is larger than the sum of its proper divisors (551962521).

1655887551 is an equidigital number, since it uses as much as digits as its factorization.

1655887551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551962520.

The product of its digits is 1680000, while the sum is 51.

The square root of 1655887551 is about 40692.5982335854. The cubic root of 1655887551 is about 1183.0695603484.

The spelling of 1655887551 in words is "one billion, six hundred fifty-five million, eight hundred eighty-seven thousand, five hundred fifty-one".