78309830980555 has 16 divisors (see below), whose sum is σ = 99717273305280. Its totient is φ = 58833675021312.

The previous prime is 78309830980543. The next prime is 78309830980639. The reversal of 78309830980555 is 55508903890387.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78309830980555 - 2⁷ = 78309830980427 is a prime.

It is a super-2 number, since 2×78309830980555² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1007939415 + ... + 1008017104.

It is an arithmetic number, because the mean of its divisors is an integer number (6232329581580).

Almost surely, 2^{78309830980555} is an apocalyptic number.

78309830980555 is a deficient number, since it is larger than the sum of its proper divisors (21407442324725).

78309830980555 is a wasteful number, since it uses less digits than its factorization.

78309830980555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015956998.

The product of its (nonzero) digits is 326592000, while the sum is 70.

The spelling of 78309830980555 in words is "seventy-eight trillion, three hundred nine billion, eight hundred thirty million, nine hundred eighty thousand, five hundred fifty-five".