55641326661 has 6 divisors (see below), whose sum is σ = 80370805190. Its totient is φ = 37094217768.

The previous prime is 55641326659. The next prime is 55641326707. The reversal of 55641326661 is 16662314655.

55641326661 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 only one way, i.e., 33240217761 + 22401108900 = 182319^2 + 149670^2 .

It is not a de Polignac number, because 55641326661 - 2¹ = 55641326659 is a prime.

It is a super-2 number, since 2×55641326661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55641326161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3091184806 + ... + 3091184823.

Almost surely, 2^55641326661 is an apocalyptic number.

It is an amenable number.

55641326661 is a deficient number, since it is larger than the sum of its proper divisors (24729478529).

55641326661 is a wasteful number, since it uses less digits than its factorization.

55641326661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6182369635 (or 6182369632 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 55641326661 in words is "fifty-five billion, six hundred forty-one million, three hundred twenty-six thousand, six hundred sixty-one".