55261665 has 24 divisors (see below), whose sum is σ = 98017920. Its totient is φ = 28786464.

The previous prime is 55261651. The next prime is 55261691. The reversal of 55261665 is 56616255.

It is a happy number.

It is not a de Polignac number, because 55261665 - 2¹⁸ = 54999521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12345 + ... + 16214.

It is an arithmetic number, because the mean of its divisors is an integer number (4084080).

Almost surely, 2^55261665 is an apocalyptic number.

It is an amenable number.

55261665 is a deficient number, since it is larger than the sum of its proper divisors (42756255).

55261665 is a wasteful number, since it uses less digits than its factorization.

55261665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28613 (or 28610 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 55261665 is about 7433.8190050606. The cubic root of 55261665 is about 380.8973828254.

The spelling of 55261665 in words is "fifty-five million, two hundred sixty-one thousand, six hundred sixty-five".