1259998652640 has 768 divisors, whose sum is σ = 5154614599680. Its totient is φ = 251237376000.

The previous prime is 1259998652603. The next prime is 1259998652669. The reversal of 1259998652640 is 462568999521.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 387571015 + ... + 387574265.

It is an arithmetic number, because the mean of its divisors is an integer number (6711737760).

Almost surely, 2^{1259998652640} is an apocalyptic number.

1259998652640 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 1259998652640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2577307299840).

1259998652640 is an abundant number, since it is smaller than the sum of its proper divisors (3894615947040).

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

1259998652640 is a wasteful number, since it uses less digits than its factorization.

1259998652640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3775 (or 3767 counting only the distinct ones).

The product of its (nonzero) digits is 83980800, while the sum is 66.

The spelling of 1259998652640 in words is "one trillion, two hundred fifty-nine billion, nine hundred ninety-eight million, six hundred fifty-two thousand, six hundred forty".