15554405668 has 24 divisors (see below), whose sum is σ = 27890374680. Its totient is φ = 7585812480.

The previous prime is 15554405623. The next prime is 15554405681. The reversal of 15554405668 is 86650445551.

It can be written as a sum of positive squares in 4 ways, for example, as 1302343744 + 14252061924 = 36088^2 + 119382^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034428 + ... + 1049356.

It is an arithmetic number, because the mean of its divisors is an integer number (1162098945).

Almost surely, 2^15554405668 is an apocalyptic number.

It is an amenable number.

15554405668 is a deficient number, since it is larger than the sum of its proper divisors (12335969012).

15554405668 is a wasteful number, since it uses less digits than its factorization.

15554405668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21327 (or 21325 counting only the distinct ones).

The product of its (nonzero) digits is 2880000, while the sum is 49.

The spelling of 15554405668 in words is "fifteen billion, five hundred fifty-four million, four hundred five thousand, six hundred sixty-eight".