64940520825 has 60 divisors (see below), whose sum is σ = 120640262160. Its totient is φ = 34534758240.

The previous prime is 64940520803. The next prime is 64940520893. The reversal of 64940520825 is 52802504946.

64940520825 is a `hidden beast` number, since 6 + 4 + 9 + 40 + 520 + 82 + 5 = 666.

It is not a de Polignac number, because 64940520825 - 2⁹ = 64940520313 is a prime.

It is a super-3 number, since 3×64940520825³ (a number of 33 digits) contains 333 as substring.

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 59 ways as a sum of consecutive naturals, for example, 656466 + ... + 748884.

It is an arithmetic number, because the mean of its divisors is an integer number (2010671036).

Almost surely, 2^64940520825 is an apocalyptic number.

It is an amenable number.

64940520825 is a deficient number, since it is larger than the sum of its proper divisors (55699741335).

64940520825 is a wasteful number, since it uses less digits than its factorization.

64940520825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92788 (or 92774 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 64940520825 in words is "sixty-four billion, nine hundred forty million, five hundred twenty thousand, eight hundred twenty-five".