55661901 has 4 divisors (see below), whose sum is σ = 74215872. Its totient is φ = 37107932.

The previous prime is 55661891. The next prime is 55661939. The reversal of 55661901 is 10916655.

55661901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55661901 - 2¹⁴ = 55645517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55661981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9276981 + ... + 9276986.

It is an arithmetic number, because the mean of its divisors is an integer number (18553968).

Almost surely, 2^55661901 is an apocalyptic number.

It is an amenable number.

55661901 is a deficient number, since it is larger than the sum of its proper divisors (18553971).

55661901 is a wasteful number, since it uses less digits than its factorization.

55661901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18553970.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 55661901 is about 7460.6903836039. The cubic root of 55661901 is about 381.8147292875.

The spelling of 55661901 in words is "fifty-five million, six hundred sixty-one thousand, nine hundred one".