11948864261 has 2 divisors, whose sum is σ = 11948864262. Its totient is φ = 11948864260.

The previous prime is 11948864227. The next prime is 11948864269. The reversal of 11948864261 is 16246884911.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9824576161 + 2124288100 = 99119^2 + 46090^2 .

It is a cyclic number.

It is not a de Polignac number, because 11948864261 - 2¹⁸ = 11948602117 is a prime.

It is a super-2 number, since 2×11948864261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11948864269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5974432130 + 5974432131.

It is an arithmetic number, because the mean of its divisors is an integer number (5974432131).

Almost surely, 2^11948864261 is an apocalyptic number.

It is an amenable number.

11948864261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11948864261 is an equidigital number, since it uses as much as digits as its factorization.

11948864261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 50.

The spelling of 11948864261 in words is "eleven billion, nine hundred forty-eight million, eight hundred sixty-four thousand, two hundred sixty-one".