55645397444 has 36 divisors (see below), whose sum is σ = 121991838444. Its totient is φ = 22013562816.

The previous prime is 55645397419. The next prime is 55645397447. The reversal of 55645397444 is 44479354655.

55645397444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6219215044 + 49426182400 = 78862^2 + 222320^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55645397444.

It is not an unprimeable number, because it can be changed into a prime (55645397447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10916879 + ... + 10921974.

It is an arithmetic number, because the mean of its divisors is an integer number (3388662179).

Almost surely, 2^55645397444 is an apocalyptic number.

It is an amenable number.

55645397444 is an abundant number, since it is smaller than the sum of its proper divisors (66346441000).

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

55645397444 is a wasteful number, since it uses less digits than its factorization.

55645397444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21838884 (or 21838875 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 56.

The spelling of 55645397444 in words is "fifty-five billion, six hundred forty-five million, three hundred ninety-seven thousand, four hundred forty-four".