79945661690 has 16 divisors (see below), whose sum is σ = 144057107880. Its totient is φ = 31943838720.

The previous prime is 79945661689. The next prime is 79945661693. The reversal of 79945661690 is 9616654997.

It can be written as a sum of positive squares in 4 ways, for example, as 43305193801 + 36640467889 = 208099^2 + 191417^2 .

It is a super-2 number, since 2×79945661690² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79945661693) 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, 4293491 + ... + 4312070.

Almost surely, 2^79945661690 is an apocalyptic number.

79945661690 is a deficient number, since it is larger than the sum of its proper divisors (64111446190).

79945661690 is a wasteful number, since it uses less digits than its factorization.

79945661690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8606497.

The product of its (nonzero) digits is 22044960, while the sum is 62.

The spelling of 79945661690 in words is "seventy-nine billion, nine hundred forty-five million, six hundred sixty-one thousand, six hundred ninety".