55137761644 has 12 divisors (see below), whose sum is σ = 110275523344. Its totient is φ = 23630469264.

The previous prime is 55137761641. The next prime is 55137761659. The reversal of 55137761644 is 44616773155.

It is a happy number.

55137761644 is an admirable number.

It is a super-2 number, since 2×55137761644² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55137761641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984602859 + ... + 984602914.

Almost surely, 2^55137761644 is an apocalyptic number.

It is an amenable number.

55137761644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

55137761644 is a wasteful number, since it uses less digits than its factorization.

55137761644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969205784 (or 1969205782 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 49.

The spelling of 55137761644 in words is "fifty-five billion, one hundred thirty-seven million, seven hundred sixty-one thousand, six hundred forty-four".