79721308685040 has 160 divisors (see below), whose sum is σ = 269606171886336. Its totient is φ = 19326148423680.

The previous prime is 79721308685023. The next prime is 79721308685069. The reversal of 79721308685040 is 4058680312797.

It is a Cunningham number, because it is equal to 8928679²-1.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 357035512 + ... + 357258728.

It is a 2-persistent number, because it is pandigital, and so is 2⋅79721308685040 = 159442617370080, but 3⋅79721308685040 = 239163926055120 is not.

Almost surely, 2^{79721308685040} is an apocalyptic number.

It is an amenable number.

79721308685040 is an abundant number, since it is smaller than the sum of its proper divisors (189884863201296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79721308685040 is a wasteful number, since it uses less digits than its factorization.

79721308685040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358527 (or 358521 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 60.

The spelling of 79721308685040 in words is "seventy-nine trillion, seven hundred twenty-one billion, three hundred eight million, six hundred eighty-five thousand, forty".