261374272997 has 2 divisors, whose sum is σ = 261374272998. Its totient is φ = 261374272996.

The previous prime is 261374272949. The next prime is 261374273009. The reversal of 261374272997 is 799272473162.

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., 153580907236 + 107793365761 = 391894^2 + 328319^2 .

It is a cyclic number.

It is not a de Polignac number, because 261374272997 - 2⁶ = 261374272933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261374272097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130687136498 + 130687136499.

It is an arithmetic number, because the mean of its divisors is an integer number (130687136499).

Almost surely, 2^261374272997 is an apocalyptic number.

It is an amenable number.

261374272997 is a deficient number, since it is larger than the sum of its proper divisors (1).

261374272997 is an equidigital number, since it uses as much as digits as its factorization.

261374272997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16003008, while the sum is 59.

The spelling of 261374272997 in words is "two hundred sixty-one billion, three hundred seventy-four million, two hundred seventy-two thousand, nine hundred ninety-seven".