55665650 has 48 divisors (see below), whose sum is σ = 112251744. Its totient is φ = 20455680.

The previous prime is 55665647. The next prime is 55665653. The reversal of 55665650 is 5656655.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55665647) and next prime (55665653).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (55665653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35789 + ... + 37311.

It is an arithmetic number, because the mean of its divisors is an integer number (2338578).

Almost surely, 2^55665650 is an apocalyptic number.

55665650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55665650 is the 6092-nd pentagonal number.

55665650 is an abundant number, since it is smaller than the sum of its proper divisors (56586094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55665650 is a wasteful number, since it uses less digits than its factorization.

55665650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595 (or 1590 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 38.

The square root of 55665650 is about 7460.9416295800. The cubic root of 55665650 is about 381.8233012266.

The spelling of 55665650 in words is "fifty-five million, six hundred sixty-five thousand, six hundred fifty".