245158021680 has 640 divisors, whose sum is σ = 929220526080. Its totient is φ = 52655616000.

The previous prime is 245158021679. The next prime is 245158021699. The reversal of 245158021680 is 86120851542.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 139372641 + ... + 139374399.

It is an arithmetic number, because the mean of its divisors is an integer number (1451907072).

Almost surely, 2^245158021680 is an apocalyptic number.

245158021680 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 245158021680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464610263040).

245158021680 is an abundant number, since it is smaller than the sum of its proper divisors (684062504400).

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

245158021680 is a wasteful number, since it uses less digits than its factorization.

245158021680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961 (or 1955 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 245158021680 in words is "two hundred forty-five billion, one hundred fifty-eight million, twenty-one thousand, six hundred eighty".