668698457 has 16 divisors (see below), whose sum is σ = 772582272. Its totient is φ = 566939520.

The previous prime is 668698411. The next prime is 668698523. The reversal of 668698457 is 754896866.

It is not a de Polignac number, because 668698457 - 2¹⁴ = 668682073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668698396 and 668698405.

It is not an unprimeable number, because it can be changed into a prime (668698357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254213 + ... + 256829.

It is an arithmetic number, because the mean of its divisors is an integer number (48286392).

Almost surely, 2^668698457 is an apocalyptic number.

It is an amenable number.

668698457 is a deficient number, since it is larger than the sum of its proper divisors (103883815).

668698457 is a wasteful number, since it uses less digits than its factorization.

668698457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008.

The product of its digits is 17418240, while the sum is 59.

The square root of 668698457 is about 25859.2044927913. The cubic root of 668698457 is about 874.4670308589.

The spelling of 668698457 in words is "six hundred sixty-eight million, six hundred ninety-eight thousand, four hundred fifty-seven".