55445613520 has 80 divisors (see below), whose sum is σ = 142324765632. Its totient is φ = 19919098880.

The previous prime is 55445613479. The next prime is 55445613521. The reversal of 55445613520 is 2531654455.

55445613520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55445613521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306517 + ... + 452596.

Almost surely, 2^55445613520 is an apocalyptic number.

It is an amenable number.

55445613520 is an abundant number, since it is smaller than the sum of its proper divisors (86879152112).

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

55445613520 is a wasteful number, since it uses less digits than its factorization.

55445613520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759220 (or 759214 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 55445613520 in words is "fifty-five billion, four hundred forty-five million, six hundred thirteen thousand, five hundred twenty".