1351256263665 has 128 divisors (see below), whose sum is σ = 2724866887680. Its totient is φ = 555448320000.

The previous prime is 1351256263657. The next prime is 1351256263711. The reversal of 1351256263665 is 5663626521531.

It is not a de Polignac number, because 1351256263665 - 2³ = 1351256263657 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 336215026 + ... + 336219044.

It is an arithmetic number, because the mean of its divisors is an integer number (21288022560).

Almost surely, 2^{1351256263665} is an apocalyptic number.

1351256263665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1351256263665 is an abundant number, since it is smaller than the sum of its proper divisors (1373610624015).

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

1351256263665 is a wasteful number, since it uses less digits than its factorization.

1351256263665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7143.

The product of its digits is 5832000, while the sum is 51.

The spelling of 1351256263665 in words is "one trillion, three hundred fifty-one billion, two hundred fifty-six million, two hundred sixty-three thousand, six hundred sixty-five".