55640215120 has 40 divisors (see below), whose sum is σ = 147844001664. Its totient is φ = 19076644992.

The previous prime is 55640215091. The next prime is 55640215121. The reversal of 55640215120 is 2151204655.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×55640215120² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55640215121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49678204 + ... + 49679323.

Almost surely, 2^55640215120 is an apocalyptic number.

It is an amenable number.

55640215120 is an abundant number, since it is smaller than the sum of its proper divisors (92203786544).

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

55640215120 is a wasteful number, since it uses less digits than its factorization.

55640215120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99357547 (or 99357541 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 55640215120 its reverse (2151204655), we get a palindrome (57791419775).

The spelling of 55640215120 in words is "fifty-five billion, six hundred forty million, two hundred fifteen thousand, one hundred twenty".