79940172007 has 2 divisors, whose sum is σ = 79940172008. Its totient is φ = 79940172006.

The previous prime is 79940171999. The next prime is 79940172047. The reversal of 79940172007 is 70027104997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79940172007 - 2³ = 79940171999 is a prime.

It is a super-2 number, since 2×79940172007² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79940172047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39970086003 + 39970086004.

It is an arithmetic number, because the mean of its divisors is an integer number (39970086004).

Almost surely, 2^79940172007 is an apocalyptic number.

79940172007 is a deficient number, since it is larger than the sum of its proper divisors (1).

79940172007 is an equidigital number, since it uses as much as digits as its factorization.

79940172007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222264, while the sum is 46.

The spelling of 79940172007 in words is "seventy-nine billion, nine hundred forty million, one hundred seventy-two thousand, seven".