657701421 has 8 divisors (see below), whose sum is σ = 944391840. Its totient is φ = 404739312.

The previous prime is 657701323. The next prime is 657701437. The reversal of 657701421 is 124107756.

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

It is not a de Polignac number, because 657701421 - 2¹⁵ = 657668653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657701441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8432031 + ... + 8432108.

It is an arithmetic number, because the mean of its divisors is an integer number (118048980).

Almost surely, 2^657701421 is an apocalyptic number.

It is an amenable number.

657701421 is a deficient number, since it is larger than the sum of its proper divisors (286690419).

657701421 is a wasteful number, since it uses less digits than its factorization.

657701421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16864155.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 657701421 is about 25645.6901057468. The cubic root of 657701421 is about 869.6468470219.

The spelling of 657701421 in words is "six hundred fifty-seven million, seven hundred one thousand, four hundred twenty-one".