79611899940721 has 8 divisors (see below), whose sum is σ = 79622549717760. Its totient is φ = 79601250592752.

The previous prime is 79611899940637. The next prime is 79611899940751. The reversal of 79611899940721 is 12704999811697.

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 79611899940721 - 2³¹ = 79609752457073 is a prime.

It is a super-2 number, since 2×79611899940721² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79611899940751) 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, 549836091 + ... + 549980863.

It is an arithmetic number, because the mean of its divisors is an integer number (9952818714720).

Almost surely, 2^{79611899940721} is an apocalyptic number.

It is an amenable number.

79611899940721 is a deficient number, since it is larger than the sum of its proper divisors (10649777039).

79611899940721 is a wasteful number, since it uses less digits than its factorization.

79611899940721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214535.

The product of its (nonzero) digits is 123451776, while the sum is 73.

The spelling of 79611899940721 in words is "seventy-nine trillion, six hundred eleven billion, eight hundred ninety-nine million, nine hundred forty thousand, seven hundred twenty-one".