1263173345864 has 16 divisors (see below), whose sum is σ = 2371334871420. Its totient is φ = 630817380160.

The previous prime is 1263173345851. The next prime is 1263173345887. The reversal of 1263173345864 is 4685433713621.

It can be written as a sum of positive squares in 2 ways, for example, as 1187249952100 + 75923393764 = 1089610^2 + 275542^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96154619 + ... + 96167754.

Almost surely, 2^{1263173345864} is an apocalyptic number.

It is an amenable number.

1263173345864 is a deficient number, since it is larger than the sum of its proper divisors (1108161525556).

1263173345864 is a wasteful number, since it uses less digits than its factorization.

1263173345864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192323200 (or 192323196 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 53.

The spelling of 1263173345864 in words is "one trillion, two hundred sixty-three billion, one hundred seventy-three million, three hundred forty-five thousand, eight hundred sixty-four".