261922382537 has 2 divisors, whose sum is σ = 261922382538. Its totient is φ = 261922382536.

The previous prime is 261922382453. The next prime is 261922382549. The reversal of 261922382537 is 735283229162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247450533136 + 14471849401 = 497444^2 + 120299^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261922382537 is a prime.

It is not a weakly prime, because it can be changed into another prime (261922382837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130961191268 + 130961191269.

It is an arithmetic number, because the mean of its divisors is an integer number (130961191269).

Almost surely, 2^261922382537 is an apocalyptic number.

It is an amenable number.

261922382537 is a deficient number, since it is larger than the sum of its proper divisors (1).

261922382537 is an equidigital number, since it uses as much as digits as its factorization.

261922382537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 50.

The spelling of 261922382537 in words is "two hundred sixty-one billion, nine hundred twenty-two million, three hundred eighty-two thousand, five hundred thirty-seven".