1287651252555 has 24 divisors (see below), whose sum is σ = 2232107392320. Its totient is φ = 686692394880.

The previous prime is 1287651252529. The next prime is 1287651252571. The reversal of 1287651252555 is 5552521567821.

1287651252555 is a `hidden beast` number, since 1 + 2 + 8 + 7 + 65 + 1 + 2 + 525 + 55 = 666.

It is not a de Polignac number, because 1287651252555 - 2⁸ = 1287651252299 is a prime.

It is a super-3 number, since 3×1287651252555³ (a number of 37 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 572691 + ... + 1703900.

It is an arithmetic number, because the mean of its divisors is an integer number (93004474680).

Almost surely, 2^{1287651252555} is an apocalyptic number.

1287651252555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287651252555 is a deficient number, since it is larger than the sum of its proper divisors (944456139765).

1287651252555 is a wasteful number, since it uses less digits than its factorization.

1287651252555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289171 (or 2289168 counting only the distinct ones).

The product of its digits is 8400000, while the sum is 54.

The spelling of 1287651252555 in words is "one trillion, two hundred eighty-seven billion, six hundred fifty-one million, two hundred fifty-two thousand, five hundred fifty-five".