55137721236 has 48 divisors (see below), whose sum is σ = 138566461824. Its totient is φ = 16963583616.

The previous prime is 55137721231. The next prime is 55137721321. The reversal of 55137721236 is 63212773155.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55137721231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2235226 + ... + 2259758.

It is an arithmetic number, because the mean of its divisors is an integer number (2886801288).

Almost surely, 2^55137721236 is an apocalyptic number.

It is an amenable number.

55137721236 is an abundant number, since it is smaller than the sum of its proper divisors (83428740588).

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

55137721236 is a wasteful number, since it uses less digits than its factorization.

55137721236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38960 (or 38958 counting only the distinct ones).

The product of its digits is 264600, while the sum is 42.

The spelling of 55137721236 in words is "fifty-five billion, one hundred thirty-seven million, seven hundred twenty-one thousand, two hundred thirty-six".