1263325649920 has 352 divisors, whose sum is σ = 3308004403200. Its totient is φ = 461168640000.

The previous prime is 1263325649903. The next prime is 1263325649941. The reversal of 1263325649920 is 299465233621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 756934846 + ... + 756936514.

Almost surely, 2^{1263325649920} is an apocalyptic number.

1263325649920 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 1263325649920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654002201600).

1263325649920 is an abundant number, since it is smaller than the sum of its proper divisors (2044678753280).

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

1263325649920 is a wasteful number, since it uses less digits than its factorization.

1263325649920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995 (or 1977 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 52.

The spelling of 1263325649920 in words is "one trillion, two hundred sixty-three billion, three hundred twenty-five million, six hundred forty-nine thousand, nine hundred twenty".