79221378737 has 2 divisors, whose sum is σ = 79221378738. Its totient is φ = 79221378736.

The previous prime is 79221378721. The next prime is 79221378763. The reversal of 79221378737 is 73787312297.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45049638001 + 34171740736 = 212249^2 + 184856^2 .

It is a cyclic number.

It is not a de Polignac number, because 79221378737 - 2⁴ = 79221378721 is a prime.

It is not a weakly prime, because it can be changed into another prime (79221378707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39610689368 + 39610689369.

It is an arithmetic number, because the mean of its divisors is an integer number (39610689369).

Almost surely, 2^79221378737 is an apocalyptic number.

It is an amenable number.

79221378737 is a deficient number, since it is larger than the sum of its proper divisors (1).

79221378737 is an equidigital number, since it uses as much as digits as its factorization.

79221378737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6223392, while the sum is 56.

The spelling of 79221378737 in words is "seventy-nine billion, two hundred twenty-one million, three hundred seventy-eight thousand, seven hundred thirty-seven".