1263993665536 has 96 divisors (see below), whose sum is σ = 2893626983520. Its totient is φ = 540735602688.

The previous prime is 1263993665471. The next prime is 1263993665569. The reversal of 1263993665536 is 6355663993621.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7906006 + ... + 8064298.

It is an arithmetic number, because the mean of its divisors is an integer number (30141947745).

Almost surely, 2^{1263993665536} is an apocalyptic number.

1263993665536 is a gapful number since it is divisible by the number (16) 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 1263993665536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1446813491760).

1263993665536 is an abundant number, since it is smaller than the sum of its proper divisors (1629633317984).

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

1263993665536 is an equidigital number, since it uses as much as digits as its factorization.

1263993665536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158879 (or 158859 counting only the distinct ones).

The product of its digits is 141717600, while the sum is 64.

The spelling of 1263993665536 in words is "one trillion, two hundred sixty-three billion, nine hundred ninety-three million, six hundred sixty-five thousand, five hundred thirty-six".