15543664425 has 48 divisors (see below), whose sum is σ = 28743576960. Its totient is φ = 8235000000.

The previous prime is 15543664387. The next prime is 15543664463. The reversal of 15543664425 is 52446634551.

15543664425 is a `hidden beast` number, since 1 + 5 + 543 + 6 + 64 + 42 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (15543664387) and next prime (15543664463).

It is not a de Polignac number, because 15543664425 - 2²¹ = 15541567273 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25675 + ... + 178175.

It is an arithmetic number, because the mean of its divisors is an integer number (598824520).

Almost surely, 2^15543664425 is an apocalyptic number.

15543664425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15543664425 is a deficient number, since it is larger than the sum of its proper divisors (13199912535).

15543664425 is a wasteful number, since it uses less digits than its factorization.

15543664425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152671 (or 152660 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 45.

The spelling of 15543664425 in words is "fifteen billion, five hundred forty-three million, six hundred sixty-four thousand, four hundred twenty-five".