245717201640 has 128 divisors (see below), whose sum is σ = 750823240320. Its totient is φ = 64316313600.

The previous prime is 245717201621. The next prime is 245717201641. The reversal of 245717201640 is 46102717542.

It is not an unprimeable number, because it can be changed into a prime (245717201641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2204860 + ... + 2313620.

It is an arithmetic number, because the mean of its divisors is an integer number (5865806565).

Almost surely, 2^245717201640 is an apocalyptic number.

245717201640 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 245717201640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375411620160).

245717201640 is an abundant number, since it is smaller than the sum of its proper divisors (505106038680).

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

245717201640 is a wasteful number, since it uses less digits than its factorization.

245717201640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109123 (or 109119 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The spelling of 245717201640 in words is "two hundred forty-five billion, seven hundred seventeen million, two hundred one thousand, six hundred forty".