78669878945055 has 32 divisors (see below), whose sum is σ = 125905587628800. Its totient is φ = 41946009553152.

The previous prime is 78669878945003. The next prime is 78669878945069. The reversal of 78669878945055 is 55054987896687.

It is not a de Polignac number, because 78669878945055 - 2⁷ = 78669878944927 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1556591976 + ... + 1556642514.

It is an arithmetic number, because the mean of its divisors is an integer number (3934549613400).

Almost surely, 2^{78669878945055} is an apocalyptic number.

78669878945055 is a deficient number, since it is larger than the sum of its proper divisors (47235708683745).

78669878945055 is a wasteful number, since it uses less digits than its factorization.

78669878945055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76343.

The product of its (nonzero) digits is 36578304000, while the sum is 87.

The spelling of 78669878945055 in words is "seventy-eight trillion, six hundred sixty-nine billion, eight hundred seventy-eight million, nine hundred forty-five thousand, fifty-five".