64874728615225 has 27 divisors (see below), whose sum is σ = 84095527550223. Its totient is φ = 49642561797840.

The previous prime is 64874728615199. The next prime is 64874728615231. The reversal of 64874728615225 is 52251682747846.

The square root of 64874728615225 is 8054485.

It is a perfect power (a square), and thus also a powerful number.

64874728615225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 23354902301481 + 41519826313744 = 4832691^2 + 6443588^2 .

It is not a de Polignac number, because 64874728615225 - 2⁷ = 64874728615097 is a prime.

It is a super-2 number, since 2×64874728615225² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 926230756 + ... + 926300794.

Almost surely, 2^{64874728615225} is an apocalyptic number.

64874728615225 is the 8054485-th square number.

64874728615225 is the 4027243-rd centered octagonal number.

It is an amenable number.

64874728615225 is a deficient number, since it is larger than the sum of its proper divisors (19220798934998).

64874728615225 is an frugal number, since it uses more digits than its factorization.

64874728615225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140134 (or 70067 counting only the distinct ones).

The product of its digits is 361267200, while the sum is 67.

The spelling of 64874728615225 in words is "sixty-four trillion, eight hundred seventy-four billion, seven hundred twenty-eight million, six hundred fifteen thousand, two hundred twenty-five".