55187209980 has 336 divisors, whose sum is σ = 205000771584. Its totient is φ = 12206609280.

The previous prime is 55187209969. The next prime is 55187210003. The reversal of 55187209980 is 8990278155.

55187209980 is a `hidden beast` number, since 551 + 8 + 7 + 2 + 0 + 9 + 9 + 80 = 666.

It is a super-2 number, since 2×55187209980² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 3155139 + ... + 3172581.

It is an arithmetic number, because the mean of its divisors is an integer number (610121344).

Almost surely, 2^55187209980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55187209980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102500385792).

55187209980 is an abundant number, since it is smaller than the sum of its proper divisors (149813561604).

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

55187209980 is a wasteful number, since it uses less digits than its factorization.

55187209980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17508 (or 17491 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 54.

The spelling of 55187209980 in words is "fifty-five billion, one hundred eighty-seven million, two hundred nine thousand, nine hundred eighty".