657666413 has 8 divisors (see below), whose sum is σ = 661479936. Its totient is φ = 653864400.

The previous prime is 657666377. The next prime is 657666421. The reversal of 657666413 is 314666756.

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 657666413 - 2¹⁴ = 657650029 is a prime.

It is a super-2 number, since 2×657666413² = 865050221576573138, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657666463) 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, 128420 + ... + 133442.

It is an arithmetic number, because the mean of its divisors is an integer number (82684992).

Almost surely, 2^657666413 is an apocalyptic number.

It is an amenable number.

657666413 is a deficient number, since it is larger than the sum of its proper divisors (3813523).

657666413 is a wasteful number, since it uses less digits than its factorization.

657666413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5755.

The product of its digits is 544320, while the sum is 44.

The square root of 657666413 is about 25645.0075648263. The cubic root of 657666413 is about 869.6314169518.

The spelling of 657666413 in words is "six hundred fifty-seven million, six hundred sixty-six thousand, four hundred thirteen".