15558880401 has 12 divisors (see below), whose sum is σ = 22476313860. Its totient is φ = 10371490560.

The previous prime is 15558880333. The next prime is 15558880427. The reversal of 15558880401 is 10408885551.

15558880401 is a `hidden beast` number, since 15 + 558 + 8 + 80 + 4 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9969822801 + 5589057600 = 99849^2 + 74760^2 .

It is not a de Polignac number, because 15558880401 - 2⁷ = 15558880273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15558880481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3721 + ... + 176441.

It is an arithmetic number, because the mean of its divisors is an integer number (1873026155).

Almost surely, 2^15558880401 is an apocalyptic number.

It is an amenable number.

15558880401 is a deficient number, since it is larger than the sum of its proper divisors (6917433459).

15558880401 is a wasteful number, since it uses less digits than its factorization.

15558880401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182736 (or 182733 counting only the distinct ones).

The product of its (nonzero) digits is 256000, while the sum is 45.

The spelling of 15558880401 in words is "fifteen billion, five hundred fifty-eight million, eight hundred eighty thousand, four hundred one".