55561111500 has 96 divisors (see below), whose sum is σ = 168828581376. Its totient is φ = 14172100800.

The previous prime is 55561111483. The next prime is 55561111517. The reversal of 55561111500 is 511116555.

It is an interprime number because it is at equal distance from previous prime (55561111483) and next prime (55561111517).

It is a super-2 number, since 2×55561111500² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 770734 + ... + 839733.

It is an arithmetic number, because the mean of its divisors is an integer number (1758631056).

Almost surely, 2^55561111500 is an apocalyptic number.

55561111500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55561111500 is an abundant number, since it is smaller than the sum of its proper divisors (113267469876).

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

55561111500 is a wasteful number, since it uses less digits than its factorization.

55561111500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610512 (or 1610500 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 30.

It can be divided in two parts, 55561111 and 500, that added together give a triangular number (55561611 = T₁₀₅₄₁).

The spelling of 55561111500 in words is "fifty-five billion, five hundred sixty-one million, one hundred eleven thousand, five hundred".