79801779572 has 6 divisors (see below), whose sum is σ = 139653114258. Its totient is φ = 39900889784.

The previous prime is 79801779569. The next prime is 79801779613. The reversal of 79801779572 is 27597710897.

It can be written as a sum of positive squares in only one way, i.e., 75820926736 + 3980852836 = 275356^2 + 63094^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9975222443 + ... + 9975222450.

It is an arithmetic number, because the mean of its divisors is an integer number (23275519043).

Almost surely, 2^79801779572 is an apocalyptic number.

It is an amenable number.

79801779572 is a deficient number, since it is larger than the sum of its proper divisors (59851334686).

79801779572 is a wasteful number, since it uses less digits than its factorization.

79801779572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19950444897 (or 19950444895 counting only the distinct ones).

The product of its (nonzero) digits is 15558480, while the sum is 62.

The spelling of 79801779572 in words is "seventy-nine billion, eight hundred one million, seven hundred seventy-nine thousand, five hundred seventy-two".