721672712476677 has 24 divisors (see below), whose sum is σ = 1122602943892248. Its totient is φ = 444105910080000.

The previous prime is 721672712476649. The next prime is 721672712476741. The reversal of 721672712476677 is 776674217276127.

721672712476677 is a `hidden beast` number, since 7 + 2 + 1 + 6 + 72 + 7 + 12 + 476 + 6 + 77 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 210035048967396 + 511637663509281 = 14492586^2 + 22619409^2 .

It is not a de Polignac number, because 721672712476677 - 2⁶ = 721672712476613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721672712576677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212269177 + ... + 215642177.

It is an arithmetic number, because the mean of its divisors is an integer number (46775122662177).

Almost surely, 2^{721672712476677} is an apocalyptic number.

It is an amenable number.

721672712476677 is a deficient number, since it is larger than the sum of its proper divisors (400930231415571).

721672712476677 is a wasteful number, since it uses less digits than its factorization.

721672712476677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5201701 (or 5201698 counting only the distinct ones).

The product of its digits is 813189888, while the sum is 72.

The spelling of 721672712476677 in words is "seven hundred twenty-one trillion, six hundred seventy-two billion, seven hundred twelve million, four hundred seventy-six thousand, six hundred seventy-seven".