15105665551 has 16 divisors (see below), whose sum is σ = 16477855200. Its totient is φ = 13792923648.

The previous prime is 15105665543. The next prime is 15105665569. The reversal of 15105665551 is 15556650151.

It is a cyclic number.

It is not a de Polignac number, because 15105665551 - 2³ = 15105665543 is a prime.

It is a super-2 number, since 2×15105665551² (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 (15105665501) 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, 294171 + ... + 341683.

It is an arithmetic number, because the mean of its divisors is an integer number (1029865950).

Almost surely, 2^15105665551 is an apocalyptic number.

15105665551 is a deficient number, since it is larger than the sum of its proper divisors (1372189649).

15105665551 is a wasteful number, since it uses less digits than its factorization.

15105665551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48138.

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

The spelling of 15105665551 in words is "fifteen billion, one hundred five million, six hundred sixty-five thousand, five hundred fifty-one".