78216117241572 has 36 divisors (see below), whose sum is σ = 197751228054016. Its totient is φ = 26066993142960.

The previous prime is 78216117241567. The next prime is 78216117241573. The reversal of 78216117241572 is 27514271161287.

78216117241572 is a `hidden beast` number, since 7 + 8 + 2 + 1 + 61 + 1 + 7 + 2 + 4 + 1 + 572 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×78216117241572² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78216117241573) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210058804 + ... + 210430827.

Almost surely, 2^{78216117241572} is an apocalyptic number.

It is an amenable number.

78216117241572 is an abundant number, since it is smaller than the sum of its proper divisors (119535110812444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78216117241572 is a wasteful number, since it uses less digits than its factorization.

78216117241572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420494808 (or 420494803 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 54.

The spelling of 78216117241572 in words is "seventy-eight trillion, two hundred sixteen billion, one hundred seventeen million, two hundred forty-one thousand, five hundred seventy-two".