15556561055651 has 32 divisors (see below), whose sum is σ = 20558730051072. Its totient is φ = 11396357429760.

The previous prime is 15556561055647. The next prime is 15556561055657. The reversal of 15556561055651 is 15655016565551.

It is a cyclic number.

It is not a de Polignac number, because 15556561055651 - 2² = 15556561055647 is a prime.

It is a super-3 number, since 3×15556561055651³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15556561055657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5364176 + ... + 7738701.

It is an arithmetic number, because the mean of its divisors is an integer number (642460314096).

Almost surely, 2^{15556561055651} is an apocalyptic number.

15556561055651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15556561055651 is a deficient number, since it is larger than the sum of its proper divisors (5002168995421).

15556561055651 is a wasteful number, since it uses less digits than its factorization.

15556561055651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13103819.

The product of its (nonzero) digits is 16875000, while the sum is 56.

It can be divided in two parts, 155565 and 61055651, that added together give a palindrome (61211216).

The spelling of 15556561055651 in words is "fifteen trillion, five hundred fifty-six billion, five hundred sixty-one million, fifty-five thousand, six hundred fifty-one".