1215761500087 has 4 divisors (see below), whose sum is σ = 1279748947480. Its totient is φ = 1151774052696.

The previous prime is 1215761500067. The next prime is 1215761500097. The reversal of 1215761500087 is 7800051675121.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1215761500087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215761500067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31993723668 + ... + 31993723705.

It is an arithmetic number, because the mean of its divisors is an integer number (319937236870).

Almost surely, 2^{1215761500087} is an apocalyptic number.

1215761500087 is a deficient number, since it is larger than the sum of its proper divisors (63987447393).

1215761500087 is an equidigital number, since it uses as much as digits as its factorization.

1215761500087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63987447392.

The product of its (nonzero) digits is 117600, while the sum is 43.

The spelling of 1215761500087 in words is "one trillion, two hundred fifteen billion, seven hundred sixty-one million, five hundred thousand, eighty-seven".