721053978361 has 8 divisors (see below), whose sum is σ = 721922572224. Its totient is φ = 720185902800.

The previous prime is 721053978319. The next prime is 721053978367. The reversal of 721053978361 is 163879350127.

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 721053978361 - 2⁷ = 721053978233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721053978299 and 721053978308.

It is not an unprimeable number, because it can be changed into a prime (721053978367) 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, 2691300 + ... + 2947066.

It is an arithmetic number, because the mean of its divisors is an integer number (90240321528).

Almost surely, 2^721053978361 is an apocalyptic number.

It is an amenable number.

721053978361 is a deficient number, since it is larger than the sum of its proper divisors (868593863).

721053978361 is a wasteful number, since it uses less digits than its factorization.

721053978361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259151.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 721053978361 in words is "seven hundred twenty-one billion, fifty-three million, nine hundred seventy-eight thousand, three hundred sixty-one".