78687633066025 has 9 divisors (see below), whose sum is σ = 97572719999653. Its totient is φ = 62950070970400.

The previous prime is 78687633065939. The next prime is 78687633066041. The reversal of 78687633066025 is 52066033678687.

The square root of 78687633066025 is 8870605.

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

It can be written as a sum of positive squares in 4 ways, for example, as 14211294025369 + 64476339040656 = 3769787^2 + 8029716^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78687633066025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43465965 + ... + 45240085.

Almost surely, 2^{78687633066025} is an apocalyptic number.

78687633066025 is the 8870605-th square number.

78687633066025 is the 4435303-rd centered octagonal number.

It is an amenable number.

78687633066025 is a deficient number, since it is larger than the sum of its proper divisors (18885086933628).

78687633066025 is an frugal number, since it uses more digits than its factorization.

78687633066025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548252 (or 1774126 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 67.

The spelling of 78687633066025 in words is "seventy-eight trillion, six hundred eighty-seven billion, six hundred thirty-three million, sixty-six thousand, twenty-five".