11661239376 has 30 divisors (see below), whose sum is σ = 32635274490. Its totient is φ = 3887079744.

The previous prime is 11661239363. The next prime is 11661239389. The reversal of 11661239376 is 67393216611.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11661239363) and next prime (11661239389).

It can be written as a sum of positive squares in only one way, i.e., 7949505600 + 3711733776 = 89160^2 + 60924^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40490271 + ... + 40490558.

It is an arithmetic number, because the mean of its divisors is an integer number (1087842483).

Almost surely, 2^11661239376 is an apocalyptic number.

11661239376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11661239376 is an abundant number, since it is smaller than the sum of its proper divisors (20974035114).

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

11661239376 is a wasteful number, since it uses less digits than its factorization.

11661239376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80980843 (or 80980834 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The spelling of 11661239376 in words is "eleven billion, six hundred sixty-one million, two hundred thirty-nine thousand, three hundred seventy-six".