261948392997 has 16 divisors (see below), whose sum is σ = 354057027840. Its totient is φ = 172240653312.

The previous prime is 261948392971. The next prime is 261948393037. The reversal of 261948392997 is 799293849162.

It is not a de Polignac number, because 261948392997 - 2²⁷ = 261814175269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261948392957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354028 + ... + 805749.

It is an arithmetic number, because the mean of its divisors is an integer number (22128564240).

Almost surely, 2^261948392997 is an apocalyptic number.

It is an amenable number.

261948392997 is a deficient number, since it is larger than the sum of its proper divisors (92108634843).

261948392997 is a wasteful number, since it uses less digits than its factorization.

261948392997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160812.

The product of its digits is 105815808, while the sum is 69.

The spelling of 261948392997 in words is "two hundred sixty-one billion, nine hundred forty-eight million, three hundred ninety-two thousand, nine hundred ninety-seven".