11661379641 has 12 divisors (see below), whose sum is σ = 16845442068. Its totient is φ = 7773686784.

The previous prime is 11661379607. The next prime is 11661379663. The reversal of 11661379641 is 14697316611.

It can be written as a sum of positive squares in 2 ways, for example, as 8682512400 + 2978867241 = 93180^2 + 54579^2 .

It is not a de Polignac number, because 11661379641 - 2¹¹ = 11661377593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11661379241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111201 + ... + 188913.

It is an arithmetic number, because the mean of its divisors is an integer number (1403786839).

Almost surely, 2^11661379641 is an apocalyptic number.

It is an amenable number.

11661379641 is a deficient number, since it is larger than the sum of its proper divisors (5184062427).

11661379641 is a wasteful number, since it uses less digits than its factorization.

11661379641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94392 (or 94389 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The spelling of 11661379641 in words is "eleven billion, six hundred sixty-one million, three hundred seventy-nine thousand, six hundred forty-one".