249513132661 has 24 divisors (see below), whose sum is σ = 279007480320. Its totient is φ = 222803006400.

The previous prime is 249513132653. The next prime is 249513132733. The reversal of 249513132661 is 166231315942.

It is not a de Polignac number, because 249513132661 - 2³ = 249513132653 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249513132361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16028800 + ... + 16044358.

It is an arithmetic number, because the mean of its divisors is an integer number (11625311680).

Almost surely, 2^249513132661 is an apocalyptic number.

It is an amenable number.

249513132661 is a deficient number, since it is larger than the sum of its proper divisors (29494347659).

249513132661 is a wasteful number, since it uses less digits than its factorization.

249513132661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18677 (or 18664 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The spelling of 249513132661 in words is "two hundred forty-nine billion, five hundred thirteen million, one hundred thirty-two thousand, six hundred sixty-one".