55980661 has 4 divisors (see below), whose sum is σ = 61069824. Its totient is φ = 50891500.

The previous prime is 55980649. The next prime is 55980671. The reversal of 55980661 is 16608955.

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 not a de Polignac number, because 55980661 - 2⁵ = 55980629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55980671) 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, 2544565 + ... + 2544586.

It is an arithmetic number, because the mean of its divisors is an integer number (15267456).

Almost surely, 2^55980661 is an apocalyptic number.

It is an amenable number.

55980661 is a deficient number, since it is larger than the sum of its proper divisors (5089163).

55980661 is a wasteful number, since it uses less digits than its factorization.

55980661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089162.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 55980661 is about 7482.0225206825. The cubic root of 55980661 is about 382.5421907980.

The spelling of 55980661 in words is "fifty-five million, nine hundred eighty thousand, six hundred sixty-one".