56667899 has 4 divisors (see below), whose sum is σ = 59650440. Its totient is φ = 53685360.

The previous prime is 56667889. The next prime is 56667911. The reversal of 56667899 is 99876665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56667899 - 2¹⁶ = 56602363 is a prime.

It is a super-2 number, since 2×56667899² = 6422501554148402, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (56667839) 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, 1491242 + ... + 1491279.

It is an arithmetic number, because the mean of its divisors is an integer number (14912610).

Almost surely, 2^56667899 is an apocalyptic number.

56667899 is a deficient number, since it is larger than the sum of its proper divisors (2982541).

56667899 is a wasteful number, since it uses less digits than its factorization.

56667899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982540.

The product of its digits is 4898880, while the sum is 56.

The square root of 56667899 is about 7527.8083796016. The cubic root of 56667899 is about 384.1012351540.

The spelling of 56667899 in words is "fifty-six million, six hundred sixty-seven thousand, eight hundred ninety-nine".