78222684681 has 72 divisors (see below), whose sum is σ = 124417190040. Its totient is φ = 47309930496.

The previous prime is 78222684667. The next prime is 78222684691. The reversal of 78222684681 is 18648622287.

It can be written as a sum of positive squares in 12 ways, for example, as 1304654400 + 76918030281 = 36120^2 + 277341^2 .

It is not a de Polignac number, because 78222684681 - 2⁵ = 78222684649 is a prime.

It is a super-2 number, since 2×78222684681² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78222684691) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10486105 + ... + 10493561.

Almost surely, 2^78222684681 is an apocalyptic number.

It is an amenable number.

78222684681 is a deficient number, since it is larger than the sum of its proper divisors (46194505359).

78222684681 is a wasteful number, since it uses less digits than its factorization.

78222684681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7643 (or 7623 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 54.

The spelling of 78222684681 in words is "seventy-eight billion, two hundred twenty-two million, six hundred eighty-four thousand, six hundred eighty-one".