261422572214491 has 2 divisors, whose sum is σ = 261422572214492. Its totient is φ = 261422572214490.

The previous prime is 261422572214359. The next prime is 261422572214533. The reversal of 261422572214491 is 194412275224162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261422572214491 - 2²¹ = 261422570117339 is a prime.

It is a super-2 number, since 2×261422572214491² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261422572211491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130711286107245 + 130711286107246.

It is an arithmetic number, because the mean of its divisors is an integer number (130711286107246).

Almost surely, 2^{261422572214491} is an apocalyptic number.

261422572214491 is a deficient number, since it is larger than the sum of its proper divisors (1).

261422572214491 is an equidigital number, since it uses as much as digits as its factorization.

261422572214491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 52.

The spelling of 261422572214491 in words is "two hundred sixty-one trillion, four hundred twenty-two billion, five hundred seventy-two million, two hundred fourteen thousand, four hundred ninety-one".