249172745920 has 168 divisors, whose sum is σ = 701916025680. Its totient is φ = 83982366720.

The previous prime is 249172745909. The next prime is 249172745947. The reversal of 249172745920 is 29547271942.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 790450 + ... + 1059790.

Almost surely, 2^249172745920 is an apocalyptic number.

249172745920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249172745920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350958012840).

249172745920 is an abundant number, since it is smaller than the sum of its proper divisors (452743279760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249172745920 is a wasteful number, since it uses less digits than its factorization.

249172745920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269431 (or 269414 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 249172745920 in words is "two hundred forty-nine billion, one hundred seventy-two million, seven hundred forty-five thousand, nine hundred twenty".