79171881601 has 4 divisors (see below), whose sum is σ = 79329281472. Its totient is φ = 79014481732.

The previous prime is 79171881587. The next prime is 79171881683. The reversal of 79171881601 is 10618817197.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10618817197 = 983 ⋅10802459.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79171881601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79171881001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78699181 + ... + 78700186.

It is an arithmetic number, because the mean of its divisors is an integer number (19832320368).

Almost surely, 2^79171881601 is an apocalyptic number.

It is an amenable number.

79171881601 is a deficient number, since it is larger than the sum of its proper divisors (157399871).

79171881601 is a wasteful number, since it uses less digits than its factorization.

79171881601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157399870.

The product of its (nonzero) digits is 169344, while the sum is 49.

The spelling of 79171881601 in words is "seventy-nine billion, one hundred seventy-one million, eight hundred eighty-one thousand, six hundred one".