55743381661 has 16 divisors (see below), whose sum is σ = 61885264320. Its totient is φ = 49781761920.

The previous prime is 55743381619. The next prime is 55743381679. The reversal of 55743381661 is 16618334755.

It is not a de Polignac number, because 55743381661 - 2⁹ = 55743381149 is a prime.

It is a super-2 number, since 2×55743381661² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55743381691) 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, 913441 + ... + 972553.

It is an arithmetic number, because the mean of its divisors is an integer number (3867829020).

Almost surely, 2^55743381661 is an apocalyptic number.

It is an amenable number.

55743381661 is a deficient number, since it is larger than the sum of its proper divisors (6141882659).

55743381661 is a wasteful number, since it uses less digits than its factorization.

55743381661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60636.

The product of its digits is 1814400, while the sum is 49.

The spelling of 55743381661 in words is "fifty-five billion, seven hundred forty-three million, three hundred eighty-one thousand, six hundred sixty-one".