78909614580621 has 32 divisors (see below), whose sum is σ = 115551041961600. Its totient is φ = 47501767424000.

The previous prime is 78909614580617. The next prime is 78909614580691. The reversal of 78909614580621 is 12608541690987.

It is a cyclic number.

It is not a de Polignac number, because 78909614580621 - 2² = 78909614580617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78909614580691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202390561 + ... + 202780073.

It is an arithmetic number, because the mean of its divisors is an integer number (3610970061300).

Almost surely, 2^{78909614580621} is an apocalyptic number.

It is an amenable number.

78909614580621 is a deficient number, since it is larger than the sum of its proper divisors (36641427380979).

78909614580621 is a wasteful number, since it uses less digits than its factorization.

78909614580621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430877.

The product of its (nonzero) digits is 52254720, while the sum is 66.

The spelling of 78909614580621 in words is "seventy-eight trillion, nine hundred nine billion, six hundred fourteen million, five hundred eighty thousand, six hundred twenty-one".