78920140553 has 12 divisors (see below), whose sum is σ = 86543343900. Its totient is φ = 71716463616.

The previous prime is 78920140531. The next prime is 78920140567. The reversal of 78920140553 is 35504102987.

It can be written as a sum of positive squares in 6 ways, for example, as 594043129 + 78326097424 = 24373^2 + 279868^2 .

It is not a de Polignac number, because 78920140553 - 2⁶ = 78920140489 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78920140573) 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, 2745728 + ... + 2774321.

It is an arithmetic number, because the mean of its divisors is an integer number (7211945325).

Almost surely, 2^78920140553 is an apocalyptic number.

It is an amenable number.

78920140553 is a deficient number, since it is larger than the sum of its proper divisors (7623203347).

78920140553 is a wasteful number, since it uses less digits than its factorization.

78920140553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520124 (or 5520095 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 78920140553 in words is "seventy-eight billion, nine hundred twenty million, one hundred forty thousand, five hundred fifty-three".