261266194967 has 2 divisors, whose sum is σ = 261266194968. Its totient is φ = 261266194966.

The previous prime is 261266194913. The next prime is 261266194993. The reversal of 261266194967 is 769491662162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261266194967 - 2⁸ = 261266194711 is a prime.

It is a super-2 number, since 2×261266194967² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261266190967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130633097483 + 130633097484.

It is an arithmetic number, because the mean of its divisors is an integer number (130633097484).

Almost surely, 2^261266194967 is an apocalyptic number.

261266194967 is a deficient number, since it is larger than the sum of its proper divisors (1).

261266194967 is an equidigital number, since it uses as much as digits as its factorization.

261266194967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 59.

The spelling of 261266194967 in words is "two hundred sixty-one billion, two hundred sixty-six million, one hundred ninety-four thousand, nine hundred sixty-seven".