55715566 has 4 divisors (see below), whose sum is σ = 83573352. Its totient is φ = 27857782.

The previous prime is 55715563. The next prime is 55715567. The reversal of 55715566 is 66551755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66551755 = 5 ⋅13310351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55715563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13928890 + ... + 13928893.

It is an arithmetic number, because the mean of its divisors is an integer number (20893338).

Almost surely, 2^55715566 is an apocalyptic number.

55715566 is a deficient number, since it is larger than the sum of its proper divisors (27857786).

55715566 is a wasteful number, since it uses less digits than its factorization.

55715566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27857785.

The product of its digits is 157500, while the sum is 40.

The square root of 55715566 is about 7464.2860341763. The cubic root of 55715566 is about 381.9373955134.

The spelling of 55715566 in words is "fifty-five million, seven hundred fifteen thousand, five hundred sixty-six".