249755187649 has 4 divisors (see below), whose sum is σ = 272460204720. Its totient is φ = 227050170580.

The previous prime is 249755187631. The next prime is 249755187719. The reversal of 249755187649 is 946781557942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 249755187649 - 2¹⁵ = 249755154881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249755187049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11352508519 + ... + 11352508540.

It is an arithmetic number, because the mean of its divisors is an integer number (68115051180).

Almost surely, 2^249755187649 is an apocalyptic number.

It is an amenable number.

249755187649 is a deficient number, since it is larger than the sum of its proper divisors (22705017071).

249755187649 is a wasteful number, since it uses less digits than its factorization.

249755187649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22705017070.

The product of its digits is 152409600, while the sum is 67.

The spelling of 249755187649 in words is "two hundred forty-nine billion, seven hundred fifty-five million, one hundred eighty-seven thousand, six hundred forty-nine".