261405850252 has 6 divisors (see below), whose sum is σ = 457460237948. Its totient is φ = 130702925124.

The previous prime is 261405850249. The next prime is 261405850259. The reversal of 261405850252 is 252058504162.

It is not an unprimeable number, because it can be changed into a prime (261405850259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32675731278 + ... + 32675731285.

Almost surely, 2^261405850252 is an apocalyptic number.

It is an amenable number.

261405850252 is a deficient number, since it is larger than the sum of its proper divisors (196054387696).

261405850252 is a wasteful number, since it uses less digits than its factorization.

261405850252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65351462567 (or 65351462565 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 40.

The spelling of 261405850252 in words is "two hundred sixty-one billion, four hundred five million, eight hundred fifty thousand, two hundred fifty-two".