721979420179 has 8 divisors (see below), whose sum is σ = 753417384192. Its totient is φ = 690545419080.

The previous prime is 721979420177. The next prime is 721979420221. The reversal of 721979420179 is 971024979127.

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 721979420179 - 2¹ = 721979420177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721979420171) 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, 615399 + ... + 1350064.

It is an arithmetic number, because the mean of its divisors is an integer number (94177173024).

Almost surely, 2^721979420179 is an apocalyptic number.

721979420179 is a deficient number, since it is larger than the sum of its proper divisors (31437964013).

721979420179 is a wasteful number, since it uses less digits than its factorization.

721979420179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981457.

The product of its (nonzero) digits is 4000752, while the sum is 58.

The spelling of 721979420179 in words is "seven hundred twenty-one billion, nine hundred seventy-nine million, four hundred twenty thousand, one hundred seventy-nine".