15551006615 has 16 divisors (see below), whose sum is σ = 20009047680. Its totient is φ = 11560773120.

The previous prime is 15551006609. The next prime is 15551006621. The reversal of 15551006615 is 51660015551.

It is an interprime number because it is at equal distance from previous prime (15551006609) and next prime (15551006621).

It is a de Polignac number, because none of the positive numbers 2^k-15551006615 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1151216 + ... + 1164645.

It is an arithmetic number, because the mean of its divisors is an integer number (1250565480).

Almost surely, 2^15551006615 is an apocalyptic number.

15551006615 is a deficient number, since it is larger than the sum of its proper divisors (4458041065).

15551006615 is a wasteful number, since it uses less digits than its factorization.

15551006615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315962.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 15551006615 in words is "fifteen billion, five hundred fifty-one million, six thousand, six hundred fifteen".