55161621420 has 96 divisors (see below), whose sum is σ = 163588336128. Its totient is φ = 13840223232.

The previous prime is 55161621407. The next prime is 55161621451. The reversal of 55161621420 is 2412616155.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4505347 + ... + 4517573.

It is an arithmetic number, because the mean of its divisors is an integer number (1704045168).

Almost surely, 2^55161621420 is an apocalyptic number.

It is an amenable number.

55161621420 is an abundant number, since it is smaller than the sum of its proper divisors (108426714708).

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

55161621420 is a wasteful number, since it uses less digits than its factorization.

55161621420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16679 (or 16677 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 55161621420 in words is "fifty-five billion, one hundred sixty-one million, six hundred twenty-one thousand, four hundred twenty".