1263261251000 has 64 divisors (see below), whose sum is σ = 3378321535680. Its totient is φ = 433118140800.

The previous prime is 1263261250981. The next prime is 1263261251027. The reversal of 1263261251000 is 1521623621.

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 15 ways as a sum of consecutive naturals, for example, 90225947 + ... + 90239946.

It is an arithmetic number, because the mean of its divisors is an integer number (52786273995).

Almost surely, 2^{1263261251000} is an apocalyptic number.

1263261251000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263261251000 is an abundant number, since it is smaller than the sum of its proper divisors (2115060284680).

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

1263261251000 is a wasteful number, since it uses less digits than its factorization.

1263261251000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180465921 (or 180465907 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 1263261251000 its reverse (1521623621), we get a palindrome (1264782874621).

The spelling of 1263261251000 in words is "one trillion, two hundred sixty-three billion, two hundred sixty-one million, two hundred fifty-one thousand".