15355431125505 has 64 divisors (see below), whose sum is σ = 27668094827520. Its totient is φ = 8079237623808.

The previous prime is 15355431125473. The next prime is 15355431125509. The reversal of 15355431125505 is 50552113455351.

15355431125505 is a `hidden beast` number, since 1 + 5 + 3 + 5 + 54 + 31 + 12 + 550 + 5 = 666.

It is not a de Polignac number, because 15355431125505 - 2⁵ = 15355431125473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (15355431125509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2225544 + ... + 5971926.

It is an arithmetic number, because the mean of its divisors is an integer number (432313981680).

Almost surely, 2^{15355431125505} is an apocalyptic number.

15355431125505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15355431125505 is a deficient number, since it is larger than the sum of its proper divisors (12312663702015).

15355431125505 is a wasteful number, since it uses less digits than its factorization.

15355431125505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746807 (or 3746801 counting only the distinct ones).

The product of its (nonzero) digits is 1125000, while the sum is 45.

The spelling of 15355431125505 in words is "fifteen trillion, three hundred fifty-five billion, four hundred thirty-one million, one hundred twenty-five thousand, five hundred five".