249840569989 has 16 divisors (see below), whose sum is σ = 271340601840. Its totient is φ = 229167221760.

The previous prime is 249840569987. The next prime is 249840570011. The reversal of 249840569989 is 989965048942.

It can be written as a sum of positive squares in 8 ways, for example, as 24206069889 + 225634500100 = 155583^2 + 475010^2 .

It is a cyclic number.

It is not a de Polignac number, because 249840569989 - 2¹ = 249840569987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249840569987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 992134 + ... + 1218199.

It is an arithmetic number, because the mean of its divisors is an integer number (16958787615).

Almost surely, 2^249840569989 is an apocalyptic number.

It is an amenable number.

249840569989 is a deficient number, since it is larger than the sum of its proper divisors (21500031851).

249840569989 is a wasteful number, since it uses less digits than its factorization.

249840569989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2210520.

The product of its (nonzero) digits is 403107840, while the sum is 73.

The spelling of 249840569989 in words is "two hundred forty-nine billion, eight hundred forty million, five hundred sixty-nine thousand, nine hundred eighty-nine".