657838081 has 4 divisors (see below), whose sum is σ = 661144000. Its totient is φ = 654532164.

The previous prime is 657838061. The next prime is 657838099. The reversal of 657838081 is 180838756.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 657838081 - 2⁷ = 657837953 is a prime.

It is a super-2 number, since 2×657838081² = 865501881627525122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657838021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652661 + ... + 1653058.

It is an arithmetic number, because the mean of its divisors is an integer number (165286000).

Almost surely, 2^657838081 is an apocalyptic number.

It is an amenable number.

657838081 is a deficient number, since it is larger than the sum of its proper divisors (3305919).

657838081 is a wasteful number, since it uses less digits than its factorization.

657838081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305918.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 657838081 is about 25648.3543526675. The cubic root of 657838081 is about 869.7070758247.

The spelling of 657838081 in words is "six hundred fifty-seven million, eight hundred thirty-eight thousand, eighty-one".