15501556651 has 6 divisors (see below), whose sum is σ = 18032423100. Its totient is φ = 13287048516.

The previous prime is 15501556601. The next prime is 15501556687. The reversal of 15501556651 is 15665510551.

It is not a de Polignac number, because 15501556651 - 2¹⁵ = 15501523883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15501556601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 158179101 + ... + 158179198.

It is an arithmetic number, because the mean of its divisors is an integer number (3005403850).

Almost surely, 2^15501556651 is an apocalyptic number.

15501556651 is a deficient number, since it is larger than the sum of its proper divisors (2530866449).

15501556651 is an equidigital number, since it uses as much as digits as its factorization.

15501556651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316358313 (or 316358306 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 15501556651 in words is "fifteen billion, five hundred one million, five hundred fifty-six thousand, six hundred fifty-one".