11661010641 has 48 divisors (see below), whose sum is σ = 20280691200. Its totient is φ = 6602220576.

The previous prime is 11661010639. The next prime is 11661010643. The reversal of 11661010641 is 14601016611.

It is a happy number.

11661010641 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 1 + 0 + 10 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (11661010639) and next prime (11661010643).

It is not a de Polignac number, because 11661010641 - 2¹ = 11661010639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11661010643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 103776 + ... + 184638.

It is an arithmetic number, because the mean of its divisors is an integer number (422514400).

Almost surely, 2^11661010641 is an apocalyptic number.

It is an amenable number.

11661010641 is a deficient number, since it is larger than the sum of its proper divisors (8619680559).

11661010641 is a wasteful number, since it uses less digits than its factorization.

11661010641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80995 (or 80982 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 11661010641 in words is "eleven billion, six hundred sixty-one million, ten thousand, six hundred forty-one".