261957716 has 6 divisors (see below), whose sum is σ = 458426010. Its totient is φ = 130978856.

The previous prime is 261957713. The next prime is 261957749. The reversal of 261957716 is 617759162.

261957716 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 140517316 + 121440400 = 11854^2 + 11020^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261957713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32744711 + ... + 32744718.

It is an arithmetic number, because the mean of its divisors is an integer number (76404335).

Almost surely, 2^261957716 is an apocalyptic number.

It is an amenable number.

261957716 is a deficient number, since it is larger than the sum of its proper divisors (196468294).

261957716 is a wasteful number, since it uses less digits than its factorization.

261957716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65489433 (or 65489431 counting only the distinct ones).

The product of its digits is 158760, while the sum is 44.

The square root of 261957716 is about 16185.1078464124. The cubic root of 261957716 is about 639.8483657691.

The spelling of 261957716 in words is "two hundred sixty-one million, nine hundred fifty-seven thousand, seven hundred sixteen".