78811442645 has 16 divisors (see below), whose sum is σ = 101899000560. Its totient is φ = 58170438144.

The previous prime is 78811442641. The next prime is 78811442653. The reversal of 78811442645 is 54624411887.

It can be written as a sum of positive squares in 8 ways, for example, as 12077570404 + 66733872241 = 109898^2 + 258329^2 .

It is not a de Polignac number, because 78811442645 - 2² = 78811442641 is a prime.

It is a super-2 number, since 2×78811442645² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78811442593 and 78811442602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78811442641) 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 15 ways as a sum of consecutive naturals, for example, 166904 + ... + 430673.

It is an arithmetic number, because the mean of its divisors is an integer number (6368687535).

Almost surely, 2^78811442645 is an apocalyptic number.

It is an amenable number.

78811442645 is a deficient number, since it is larger than the sum of its proper divisors (23087557915).

78811442645 is a wasteful number, since it uses less digits than its factorization.

78811442645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599624.

The product of its digits is 1720320, while the sum is 50.

The spelling of 78811442645 in words is "seventy-eight billion, eight hundred eleven million, four hundred forty-two thousand, six hundred forty-five".