11661165377 has 2 divisors, whose sum is σ = 11661165378. Its totient is φ = 11661165376.

The previous prime is 11661165361. The next prime is 11661165433. The reversal of 11661165377 is 77356116611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11586584881 + 74580496 = 107641^2 + 8636^2 .

It is a cyclic number.

It is not a de Polignac number, because 11661165377 - 2⁴ = 11661165361 is a prime.

It is not a weakly prime, because it can be changed into another prime (11661165337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5830582688 + 5830582689.

It is an arithmetic number, because the mean of its divisors is an integer number (5830582689).

Almost surely, 2^11661165377 is an apocalyptic number.

It is an amenable number.

11661165377 is a deficient number, since it is larger than the sum of its proper divisors (1).

11661165377 is an equidigital number, since it uses as much as digits as its factorization.

11661165377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 44.

The spelling of 11661165377 in words is "eleven billion, six hundred sixty-one million, one hundred sixty-five thousand, three hundred seventy-seven".