55687721137540 has 12 divisors (see below), whose sum is σ = 116944214388876. Its totient is φ = 22275088455008.

The previous prime is 55687721137537. The next prime is 55687721137661. The reversal of 55687721137540 is 4573112778655.

55687721137540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 28594280359044 + 27093440778496 = 5347362^2 + 5205136^2 .

It is a super-2 number, since 2×55687721137540² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1392193028419 + ... + 1392193028458.

It is an arithmetic number, because the mean of its divisors is an integer number (9745351199073).

Almost surely, 2^{55687721137540} is an apocalyptic number.

It is an amenable number.

55687721137540 is an abundant number, since it is smaller than the sum of its proper divisors (61256493251336).

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

55687721137540 is a wasteful number, since it uses less digits than its factorization.

55687721137540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2784386056886 (or 2784386056884 counting only the distinct ones).

The product of its (nonzero) digits is 49392000, while the sum is 61.

The spelling of 55687721137540 in words is "fifty-five trillion, six hundred eighty-seven billion, seven hundred twenty-one million, one hundred thirty-seven thousand, five hundred forty".