55494512640 has 936 divisors, whose sum is σ = 232149977280. Its totient is φ = 12469469184.

The previous prime is 55494512597. The next prime is 55494512707. The reversal of 55494512640 is 4621549455.

55494512640 is a `hidden beast` number, since 5 + 5 + 4 + 94 + 512 + 6 + 40 = 666.

It is a super-2 number, since 2×55494512640² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 940584931 + ... + 940584989.

It is an arithmetic number, because the mean of its divisors is an integer number (248023480).

Almost surely, 2^55494512640 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 55494512640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116074988640).

55494512640 is an abundant number, since it is smaller than the sum of its proper divisors (176655464640).

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

55494512640 is an frugal number, since it uses more digits than its factorization.

55494512640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 55494512640 in words is "fifty-five billion, four hundred ninety-four million, five hundred twelve thousand, six hundred forty".