12057766261 has 6 divisors (see below), whose sum is σ = 12604811030. Its totient is φ = 11533515048.

The previous prime is 12057766243. The next prime is 12057766271. The reversal of 12057766261 is 16266775021.

It can be written as a sum of positive squares in only one way, i.e., 11950643761 + 107122500 = 109319^2 + 10350^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12057766261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12057766271) 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, 11396226 + ... + 11397283.

Almost surely, 2^12057766261 is an apocalyptic number.

It is an amenable number.

12057766261 is a deficient number, since it is larger than the sum of its proper divisors (547044769).

12057766261 is an equidigital number, since it uses as much as digits as its factorization.

12057766261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22793555 (or 22793532 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 12057766261 in words is "twelve billion, fifty-seven million, seven hundred sixty-six thousand, two hundred sixty-one".