78506655768225 has 72 divisors (see below), whose sum is σ = 140745595723200. Its totient is φ = 41831087064960.

The previous prime is 78506655768007. The next prime is 78506655768323. The reversal of 78506655768225 is 52286755660587.

78506655768225 is a `hidden beast` number, since 7 + 8 + 5 + 0 + 6 + 6 + 557 + 68 + 2 + 2 + 5 = 666.

It is not a de Polignac number, because 78506655768225 - 2¹³ = 78506655760033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1693792351 + ... + 1693838699.

It is an arithmetic number, because the mean of its divisors is an integer number (1954799940600).

Almost surely, 2^{78506655768225} is an apocalyptic number.

78506655768225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78506655768225 is a deficient number, since it is larger than the sum of its proper divisors (62238939954975).

78506655768225 is a wasteful number, since it uses less digits than its factorization.

78506655768225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53239 (or 53231 counting only the distinct ones).

The product of its (nonzero) digits is 1693440000, while the sum is 72.

The spelling of 78506655768225 in words is "seventy-eight trillion, five hundred six billion, six hundred fifty-five million, seven hundred sixty-eight thousand, two hundred twenty-five".