15651155551 has 8 divisors (see below), whose sum is σ = 17043001200. Its totient is φ = 14316120000.

The previous prime is 15651155521. The next prime is 15651155563. The reversal of 15651155551 is 15555115651.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15651155551 - 2⁷ = 15651155423 is a prime.

It is a super-2 number, since 2×15651155551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15651155501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14201950 + ... + 14203051.

It is an arithmetic number, because the mean of its divisors is an integer number (2130375150).

Almost surely, 2^15651155551 is an apocalyptic number.

15651155551 is a deficient number, since it is larger than the sum of its proper divisors (1391845649).

15651155551 is a wasteful number, since it uses less digits than its factorization.

15651155551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28405049.

The product of its digits is 93750, while the sum is 40.

The spelling of 15651155551 in words is "fifteen billion, six hundred fifty-one million, one hundred fifty-five thousand, five hundred fifty-one".