1263625031256 has 128 divisors (see below), whose sum is σ = 3685587072000. Its totient is φ = 360883918080.

The previous prime is 1263625031237. The next prime is 1263625031269. The reversal of 1263625031256 is 6521305263621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20326701 + ... + 20388771.

It is an arithmetic number, because the mean of its divisors is an integer number (28793649000).

Almost surely, 2^{1263625031256} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263625031256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1842793536000).

1263625031256 is an abundant number, since it is smaller than the sum of its proper divisors (2421962040744).

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

1263625031256 is a wasteful number, since it uses less digits than its factorization.

1263625031256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64574 (or 64556 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 1263625031256 in words is "one trillion, two hundred sixty-three billion, six hundred twenty-five million, thirty-one thousand, two hundred fifty-six".