15655855651 has 4 divisors (see below), whose sum is σ = 15679119112. Its totient is φ = 15632592192.

The previous prime is 15655855637. The next prime is 15655855669.

15655855651 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15655855651 is a prime.

It is a super-4 number, since 4×15655855651⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15655855051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11630721 + ... + 11632066.

It is an arithmetic number, because the mean of its divisors is an integer number (3919779778).

Almost surely, 2^15655855651 is an apocalyptic number.

15655855651 is a deficient number, since it is larger than the sum of its proper divisors (23263461).

15655855651 is an equidigital number, since it uses as much as digits as its factorization.

15655855651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23263460.

The product of its digits is 4500000, while the sum is 52.

The spelling of 15655855651 in words is "fifteen billion, six hundred fifty-five million, eight hundred fifty-five thousand, six hundred fifty-one".