64542616625 has 8 divisors (see below), whose sum is σ = 80549185704. Its totient is φ = 51634093200.

The previous prime is 64542616549. The next prime is 64542616651. The reversal of 64542616625 is 52661624546.

It can be written as a sum of positive squares in 4 ways, for example, as 14352279601 + 50190337024 = 119801^2 + 224032^2 .

It is not a de Polignac number, because 64542616625 - 2¹⁰ = 64542615601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64542616625.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258170342 + ... + 258170591.

It is an arithmetic number, because the mean of its divisors is an integer number (10068648213).

Almost surely, 2^64542616625 is an apocalyptic number.

It is an amenable number.

64542616625 is a deficient number, since it is larger than the sum of its proper divisors (16006569079).

64542616625 is an equidigital number, since it uses as much as digits as its factorization.

64542616625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516340948 (or 516340938 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 47.

The spelling of 64542616625 in words is "sixty-four billion, five hundred forty-two million, six hundred sixteen thousand, six hundred twenty-five".