1287625515957 has 12 divisors (see below), whose sum is σ = 2028985661664. Its totient is φ = 780379100520.

The previous prime is 1287625515929. The next prime is 1287625515983. The reversal of 1287625515957 is 7595155267821.

1287625515957 is a `hidden beast` number, since 1 + 2 + 8 + 7 + 6 + 25 + 515 + 95 + 7 = 666.

It is not a de Polignac number, because 1287625515957 - 2⁶ = 1287625515893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1287625515894 and 1287625515903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287625515907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6503159073 + ... + 6503159270.

It is an arithmetic number, because the mean of its divisors is an integer number (169082138472).

Almost surely, 2^{1287625515957} is an apocalyptic number.

It is an amenable number.

1287625515957 is a deficient number, since it is larger than the sum of its proper divisors (741360145707).

1287625515957 is a wasteful number, since it uses less digits than its factorization.

1287625515957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13006318360 (or 13006318357 counting only the distinct ones).

The product of its digits is 52920000, while the sum is 63.

The spelling of 1287625515957 in words is "one trillion, two hundred eighty-seven billion, six hundred twenty-five million, five hundred fifteen thousand, nine hundred fifty-seven".