55015645440 has 576 divisors, whose sum is σ = 209623744512. Its totient is φ = 12032409600.

The previous prime is 55015645423. The next prime is 55015645441. The reversal of 55015645440 is 4454651055.

It is not an unprimeable number, because it can be changed into a prime (55015645441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85827520 + ... + 85828160.

It is an arithmetic number, because the mean of its divisors is an integer number (363930112).

Almost surely, 2^55015645440 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 55015645440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104811872256).

55015645440 is an abundant number, since it is smaller than the sum of its proper divisors (154608099072).

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

55015645440 is a wasteful number, since it uses less digits than its factorization.

55015645440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 39.

The spelling of 55015645440 in words is "fifty-five billion, fifteen million, six hundred forty-five thousand, four hundred forty".