55408297581 has 144 divisors (see below), whose sum is σ = 101745072000. Its totient is φ = 28439244288.

The previous prime is 55408297573. The next prime is 55408297583. The reversal of 55408297581 is 18579280455.

55408297581 is a `hidden beast` number, since 5 + 54 + 0 + 8 + 2 + 9 + 7 + 581 = 666.

It is not a de Polignac number, because 55408297581 - 2³ = 55408297573 is a prime.

It is a super-2 number, since 2×55408297581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55408297583) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 84079030 + ... + 84079688.

It is an arithmetic number, because the mean of its divisors is an integer number (706563000).

Almost surely, 2^55408297581 is an apocalyptic number.

It is an amenable number.

55408297581 is a deficient number, since it is larger than the sum of its proper divisors (46336774419).

55408297581 is a wasteful number, since it uses less digits than its factorization.

55408297581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 54.

The spelling of 55408297581 in words is "fifty-five billion, four hundred eight million, two hundred ninety-seven thousand, five hundred eighty-one".