55985421659964 has 24 divisors (see below), whose sum is σ = 130658940204240. Its totient is φ = 18658051553664.

The previous prime is 55985421659963. The next prime is 55985421660059. The reversal of 55985421659964 is 46995612458955.

It is a self number, because there is not a number n which added to its sum of digits gives 55985421659964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55985421659963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469396179 + ... + 469515434.

It is an arithmetic number, because the mean of its divisors is an integer number (5444122508510).

Almost surely, 2^{55985421659964} is an apocalyptic number.

It is an amenable number.

55985421659964 is an abundant number, since it is smaller than the sum of its proper divisors (74673518544276).

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

55985421659964 is a wasteful number, since it uses less digits than its factorization.

55985421659964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938916589 (or 938916587 counting only the distinct ones).

The product of its digits is 4199040000, while the sum is 78.

The spelling of 55985421659964 in words is "fifty-five trillion, nine hundred eighty-five billion, four hundred twenty-one million, six hundred fifty-nine thousand, nine hundred sixty-four".