54495021581 has 24 divisors (see below), whose sum is σ = 73570181184. Its totient is φ = 39197208960.

The previous prime is 54495021571. The next prime is 54495021593. The reversal of 54495021581 is 18512059445.

It is a de Polignac number, because none of the positive numbers 2^k-54495021581 is a prime.

It is a super-2 number, since 2×54495021581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54495021571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2080856 + ... + 2106881.

It is an arithmetic number, because the mean of its divisors is an integer number (3065424216).

Almost surely, 2^54495021581 is an apocalyptic number.

It is an amenable number.

54495021581 is a deficient number, since it is larger than the sum of its proper divisors (19075159603).

54495021581 is a wasteful number, since it uses less digits than its factorization.

54495021581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187781 (or 4187768 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 44.

The spelling of 54495021581 in words is "fifty-four billion, four hundred ninety-five million, twenty-one thousand, five hundred eighty-one".