55501213536 has 72 divisors (see below), whose sum is σ = 158098220280. Its totient is φ = 18469149696.

The previous prime is 55501213531. The next prime is 55501213567. The reversal of 55501213536 is 63531210555.

55501213536 is a `hidden beast` number, since 55 + 50 + 1 + 21 + 3 + 536 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 55501213536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55501213531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8295 + ... + 333273.

It is an arithmetic number, because the mean of its divisors is an integer number (2195808615).

Almost surely, 2^55501213536 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 55501213536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79049110140).

55501213536 is an abundant number, since it is smaller than the sum of its proper divisors (102597006744).

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

55501213536 is a wasteful number, since it uses less digits than its factorization.

55501213536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325588 (or 325577 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

The spelling of 55501213536 in words is "fifty-five billion, five hundred one million, two hundred thirteen thousand, five hundred thirty-six".