1245329647920 has 480 divisors, whose sum is σ = 4440970759680. Its totient is φ = 311861145600.

The previous prime is 1245329647897. The next prime is 1245329647927. The reversal of 1245329647920 is 297469235421.

It is a happy number.

1245329647920 is a `hidden beast` number, since 1 + 24 + 532 + 9 + 64 + 7 + 9 + 20 = 666.

It is not an unprimeable number, because it can be changed into a prime (1245329647927) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1373020107 + ... + 1373021013.

It is an arithmetic number, because the mean of its divisors is an integer number (9252022416).

Almost surely, 2^{1245329647920} is an apocalyptic number.

1245329647920 is a gapful number since it is divisible by the number (10) 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 1245329647920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2220485379840).

1245329647920 is an abundant number, since it is smaller than the sum of its proper divisors (3195641111760).

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

1245329647920 is a wasteful number, since it uses less digits than its factorization.

1245329647920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713 (or 1704 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 1245329647920 in words is "one trillion, two hundred forty-five billion, three hundred twenty-nine million, six hundred forty-seven thousand, nine hundred twenty".