1287641625015 has 16 divisors (see below), whose sum is σ = 2060492313600. Its totient is φ = 686653628832.

The previous prime is 1287641624989. The next prime is 1287641625019. The reversal of 1287641625015 is 5105261467821.

It is a happy number.

It is not a de Polignac number, because 1287641625015 - 2¹⁸ = 1287641362871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287641625019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5415435 + ... + 5648204.

It is an arithmetic number, because the mean of its divisors is an integer number (128780769600).

Almost surely, 2^{1287641625015} is an apocalyptic number.

1287641625015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287641625015 is a deficient number, since it is larger than the sum of its proper divisors (772850688585).

1287641625015 is a wasteful number, since it uses less digits than its factorization.

1287641625015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11071406.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 1287641625015 in words is "one trillion, two hundred eighty-seven billion, six hundred forty-one million, six hundred twenty-five thousand, fifteen".