55507665 has 8 divisors (see below), whose sum is σ = 88812288. Its totient is φ = 29604080.

The previous prime is 55507663. The next prime is 55507679. The reversal of 55507665 is 56670555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55507665 - 2¹ = 55507663 is a prime.

It is a super-2 number, since 2×55507665² = 6162201747504450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55507663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1850241 + ... + 1850270.

It is an arithmetic number, because the mean of its divisors is an integer number (11101536).

Almost surely, 2^55507665 is an apocalyptic number.

It is an amenable number.

55507665 is a deficient number, since it is larger than the sum of its proper divisors (33304623).

55507665 is a wasteful number, since it uses less digits than its factorization.

55507665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700519.

The product of its (nonzero) digits is 157500, while the sum is 39.

The square root of 55507665 is about 7450.3466362311. The cubic root of 55507665 is about 381.4617406624.

The spelling of 55507665 in words is "fifty-five million, five hundred seven thousand, six hundred sixty-five".