78162330557 has 4 divisors (see below), whose sum is σ = 78248129856. Its totient is φ = 78076531260.

The previous prime is 78162330551. The next prime is 78162330581. The reversal of 78162330557 is 75503326187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78162330557 - 2²⁶ = 78095221693 is a prime.

It is a super-2 number, since 2×78162330557² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78162330551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42898283 + ... + 42900104.

It is an arithmetic number, because the mean of its divisors is an integer number (19562032464).

Almost surely, 2^78162330557 is an apocalyptic number.

It is an amenable number.

78162330557 is a deficient number, since it is larger than the sum of its proper divisors (85799299).

78162330557 is an equidigital number, since it uses as much as digits as its factorization.

78162330557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85799298.

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 78162330557 in words is "seventy-eight billion, one hundred sixty-two million, three hundred thirty thousand, five hundred fifty-seven".