55340987220 has 36 divisors (see below), whose sum is σ = 167867661780. Its totient is φ = 14757596544.

The previous prime is 55340987197. The next prime is 55340987243. The reversal of 55340987220 is 2278904355.

55340987220 is a `hidden beast` number, since 5 + 5 + 340 + 9 + 87 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (55340987197) and next prime (55340987243).

It can be written as a sum of positive squares in 2 ways, for example, as 5659251984 + 49681735236 = 75228^2 + 222894^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153724785 + ... + 153725144.

It is an arithmetic number, because the mean of its divisors is an integer number (4662990605).

Almost surely, 2^55340987220 is an apocalyptic number.

It is an amenable number.

55340987220 is an abundant number, since it is smaller than the sum of its proper divisors (112526674560).

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

55340987220 is a wasteful number, since it uses less digits than its factorization.

55340987220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307449944 (or 307449939 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 55340987220 in words is "fifty-five billion, three hundred forty million, nine hundred eighty-seven thousand, two hundred twenty".