79720017077 has 8 divisors (see below), whose sum is σ = 83246724864. Its totient is φ = 76198361008.

The previous prime is 79720017061. The next prime is 79720017121. The reversal of 79720017077 is 77071002797.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79720017077 - 2⁴ = 79720017061 is a prime.

It is a super-2 number, since 2×79720017077² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79720017007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230653 + ... + 1293810.

It is an arithmetic number, because the mean of its divisors is an integer number (10405840608).

Almost surely, 2^79720017077 is an apocalyptic number.

It is an amenable number.

79720017077 is a deficient number, since it is larger than the sum of its proper divisors (3526707787).

79720017077 is a wasteful number, since it uses less digits than its factorization.

79720017077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525859.

The product of its (nonzero) digits is 302526, while the sum is 47.

The spelling of 79720017077 in words is "seventy-nine billion, seven hundred twenty million, seventeen thousand, seventy-seven".