55406733520 has 40 divisors (see below), whose sum is σ = 130096126440. Its totient is φ = 21943257600.

The previous prime is 55406733509. The next prime is 55406733521. The reversal of 55406733520 is 2533760455.

It can be written as a sum of positive squares in 4 ways, for example, as 36908557456 + 18498176064 = 192116^2 + 136008^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×55406733520² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55406733521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3420555 + ... + 3436714.

It is an arithmetic number, because the mean of its divisors is an integer number (3252403161).

Almost surely, 2^55406733520 is an apocalyptic number.

It is an amenable number.

55406733520 is an abundant number, since it is smaller than the sum of its proper divisors (74689392920).

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

55406733520 is a wasteful number, since it uses less digits than its factorization.

55406733520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6857383 (or 6857377 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 40.

The spelling of 55406733520 in words is "fifty-five billion, four hundred six million, seven hundred thirty-three thousand, five hundred twenty".