15555474755409 has 32 divisors (see below), whose sum is σ = 22148554752000. Its totient is φ = 9689464169280.

The previous prime is 15555474755393. The next prime is 15555474755461. The reversal of 15555474755409 is 90455747455551.

It is not a de Polignac number, because 15555474755409 - 2⁴ = 15555474755393 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15555474755409.

It is not an unprimeable number, because it can be changed into a prime (15555474751409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156913152 + ... + 157012254.

It is an arithmetic number, because the mean of its divisors is an integer number (692142336000).

Almost surely, 2^{15555474755409} is an apocalyptic number.

It is an amenable number.

15555474755409 is a deficient number, since it is larger than the sum of its proper divisors (6593079996591).

15555474755409 is a wasteful number, since it uses less digits than its factorization.

15555474755409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157365.

The product of its (nonzero) digits is 441000000, while the sum is 66.

The spelling of 15555474755409 in words is "fifteen trillion, five hundred fifty-five billion, four hundred seventy-four million, seven hundred fifty-five thousand, four hundred nine".