55142231520 has 48 divisors (see below), whose sum is σ = 173698030800. Its totient is φ = 14704594944.

The previous prime is 55142231519. The next prime is 55142231587. The reversal of 55142231520 is 2513224155.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57439345 + ... + 57440304.

It is an arithmetic number, because the mean of its divisors is an integer number (3618708975).

Almost surely, 2^55142231520 is an apocalyptic number.

It is an amenable number.

55142231520 is an abundant number, since it is smaller than the sum of its proper divisors (118555799280).

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

55142231520 is a wasteful number, since it uses less digits than its factorization.

55142231520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114879667 (or 114879659 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 55142231520 its reverse (2513224155), we get a palindrome (57655455675).

The spelling of 55142231520 in words is "fifty-five billion, one hundred forty-two million, two hundred thirty-one thousand, five hundred twenty".