15551656656067 has 16 divisors (see below), whose sum is σ = 18761423544000. Its totient is φ = 12870336534720.

The previous prime is 15551656656031. The next prime is 15551656656091. The reversal of 15551656656067 is 76065665615551.

It is a happy number.

It is not a de Polignac number, because 15551656656067 - 2³⁹ = 15001900842179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15551656656167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781716034 + ... + 781735927.

It is an arithmetic number, because the mean of its divisors is an integer number (1172588971500).

Almost surely, 2^{15551656656067} is an apocalyptic number.

15551656656067 is a deficient number, since it is larger than the sum of its proper divisors (3209766887933).

15551656656067 is an equidigital number, since it uses as much as digits as its factorization.

15551656656067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563452011 (or 1563451997 counting only the distinct ones).

The product of its (nonzero) digits is 170100000, while the sum is 64.

The spelling of 15551656656067 in words is "fifteen trillion, five hundred fifty-one billion, six hundred fifty-six million, six hundred fifty-six thousand, sixty-seven".