249953746861 has 8 divisors (see below), whose sum is σ = 307635380864. Its totient is φ = 197765601840.

The previous prime is 249953746849. The next prime is 249953746871. The reversal of 249953746861 is 168647359942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 249953746861 - 2⁵ = 249953746829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249953746793 and 249953746802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249953746871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1373372145 + ... + 1373372326.

It is an arithmetic number, because the mean of its divisors is an integer number (38454422608).

Almost surely, 2^249953746861 is an apocalyptic number.

It is an amenable number.

249953746861 is a deficient number, since it is larger than the sum of its proper divisors (57681634003).

249953746861 is a wasteful number, since it uses less digits than its factorization.

249953746861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746744491.

The product of its digits is 78382080, while the sum is 64.

The spelling of 249953746861 in words is "two hundred forty-nine billion, nine hundred fifty-three million, seven hundred forty-six thousand, eight hundred sixty-one".