56668013 has 4 divisors (see below), whose sum is σ = 59650560. Its totient is φ = 53685468.

The previous prime is 56667983. The next prime is 56668037. The reversal of 56668013 is 31086665.

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 56668013 - 2¹⁰ = 56666989 is a prime.

It is a super-2 number, since 2×56668013² = 6422527394736338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56668063) 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, 1491245 + ... + 1491282.

It is an arithmetic number, because the mean of its divisors is an integer number (14912640).

Almost surely, 2^56668013 is an apocalyptic number.

It is an amenable number.

56668013 is a deficient number, since it is larger than the sum of its proper divisors (2982547).

56668013 is a wasteful number, since it uses less digits than its factorization.

56668013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2982546.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 56668013 is about 7527.8159515227. The cubic root of 56668013 is about 384.1014927220.

The spelling of 56668013 in words is "fifty-six million, six hundred sixty-eight thousand, thirteen".