55757661 has 16 divisors (see below), whose sum is σ = 75311808. Its totient is φ = 36691200.

The previous prime is 55757659. The next prime is 55757683. The reversal of 55757661 is 16675755.

It is not a de Polignac number, because 55757661 - 2¹ = 55757659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55757621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132231 + ... + 132651.

It is an arithmetic number, because the mean of its divisors is an integer number (4706988).

Almost surely, 2^55757661 is an apocalyptic number.

It is an amenable number.

55757661 is a deficient number, since it is larger than the sum of its proper divisors (19554147).

55757661 is a wasteful number, since it uses less digits than its factorization.

55757661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892.

The product of its digits is 220500, while the sum is 42.

The square root of 55757661 is about 7467.1052624160. The cubic root of 55757661 is about 382.0335601848.

The spelling of 55757661 in words is "fifty-five million, seven hundred fifty-seven thousand, six hundred sixty-one".