15664450425 has 96 divisors (see below), whose sum is σ = 28814822400. Its totient is φ = 7458739200.

The previous prime is 15664450423. The next prime is 15664450463. The reversal of 15664450425 is 52405446651.

It is not a de Polignac number, because 15664450425 - 2¹ = 15664450423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15664450423) 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 95 ways as a sum of consecutive naturals, for example, 6528376 + ... + 6530774.

It is an arithmetic number, because the mean of its divisors is an integer number (300154400).

Almost surely, 2^15664450425 is an apocalyptic number.

15664450425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15664450425 is a deficient number, since it is larger than the sum of its proper divisors (13150371975).

15664450425 is a wasteful number, since it uses less digits than its factorization.

15664450425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643 (or 2638 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 15664450425 in words is "fifteen billion, six hundred sixty-four million, four hundred fifty thousand, four hundred twenty-five".