721378347362057 has 8 divisors (see below), whose sum is σ = 899380796711232. Its totient is φ = 562112997944400.

The previous prime is 721378347362021. The next prime is 721378347362089. The reversal of 721378347362057 is 750263743873127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721378347362057 - 2⁶ = 721378347361993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721378347361984 and 721378347362002.

It is not an unprimeable number, because it can be changed into a prime (721378347362557) 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, 4684274982794 + ... + 4684274982947.

It is an arithmetic number, because the mean of its divisors is an integer number (112422599588904).

Almost surely, 2^{721378347362057} is an apocalyptic number.

721378347362057 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

721378347362057 is a deficient number, since it is larger than the sum of its proper divisors (178002449349175).

721378347362057 is a wasteful number, since it uses less digits than its factorization.

721378347362057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9368549965759.

The product of its (nonzero) digits is 248935680, while the sum is 65.

The spelling of 721378347362057 in words is "seven hundred twenty-one trillion, three hundred seventy-eight billion, three hundred forty-seven million, three hundred sixty-two thousand, fifty-seven".