55619794640 has 20 divisors (see below), whose sum is σ = 129316022724. Its totient is φ = 22247917824.

The previous prime is 55619794627. The next prime is 55619794673. The reversal of 55619794640 is 4649791655.

It can be written as a sum of positive squares in 2 ways, for example, as 29995468864 + 25624325776 = 173192^2 + 160076^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347623637 + ... + 347623796.

Almost surely, 2^55619794640 is an apocalyptic number.

It is an amenable number.

55619794640 is an abundant number, since it is smaller than the sum of its proper divisors (73696228084).

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

55619794640 is a wasteful number, since it uses less digits than its factorization.

55619794640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695247446 (or 695247440 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 56.

The spelling of 55619794640 in words is "fifty-five billion, six hundred nineteen million, seven hundred ninety-four thousand, six hundred forty".