55561809390 has 32 divisors (see below), whose sum is σ = 133413129216. Its totient is φ = 14809284000.

The previous prime is 55561809283. The next prime is 55561809419. The reversal of 55561809390 is 9390816555.

It is a super-2 number, since 2×55561809390² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386986 + ... + 510765.

It is an arithmetic number, because the mean of its divisors is an integer number (4169160288).

Almost surely, 2^55561809390 is an apocalyptic number.

55561809390 is an abundant number, since it is smaller than the sum of its proper divisors (77851319826).

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

55561809390 is a wasteful number, since it uses less digits than its factorization.

55561809390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899824.

The product of its (nonzero) digits is 1458000, while the sum is 51.

The spelling of 55561809390 in words is "fifty-five billion, five hundred sixty-one million, eight hundred nine thousand, three hundred ninety".