56621966 has 4 divisors (see below), whose sum is σ = 84932952. Its totient is φ = 28310982.

The previous prime is 56621953. The next prime is 56621987. The reversal of 56621966 is 66912665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66912665 = 5 ⋅13382533.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155490 + ... + 14155493.

It is an arithmetic number, because the mean of its divisors is an integer number (21233238).

Almost surely, 2^56621966 is an apocalyptic number.

56621966 is a deficient number, since it is larger than the sum of its proper divisors (28310986).

56621966 is a wasteful number, since it uses less digits than its factorization.

56621966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28310985.

The product of its digits is 116640, while the sum is 41.

The square root of 56621966 is about 7524.7568731488. The cubic root of 56621966 is about 383.9974274640.

The spelling of 56621966 in words is "fifty-six million, six hundred twenty-one thousand, nine hundred sixty-six".