55561566510 has 24 divisors (see below), whose sum is σ = 144460073160. Its totient is φ = 14816417712.

The previous prime is 55561566503. The next prime is 55561566517. The reversal of 55561566510 is 1566516555.

It is an interprime number because it is at equal distance from previous prime (55561566503) and next prime (55561566517).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561566517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308675280 + ... + 308675459.

It is an arithmetic number, because the mean of its divisors is an integer number (6019169715).

Almost surely, 2^55561566510 is an apocalyptic number.

55561566510 is an abundant number, since it is smaller than the sum of its proper divisors (88898506650).

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

55561566510 is a wasteful number, since it uses less digits than its factorization.

55561566510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617350752 (or 617350749 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 55561566510 in words is "fifty-five billion, five hundred sixty-one million, five hundred sixty-six thousand, five hundred ten".