87861801615 has 64 divisors (see below), whose sum is σ = 165911224320. Its totient is φ = 38854033920.

The previous prime is 87861801569. The next prime is 87861801617. The reversal of 87861801615 is 51610816878.

It is not a de Polignac number, because 87861801615 - 2¹⁰ = 87861800591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87861801617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12355681 + ... + 12362789.

It is an arithmetic number, because the mean of its divisors is an integer number (2592362880).

Almost surely, 2^87861801615 is an apocalyptic number.

87861801615 is a deficient number, since it is larger than the sum of its proper divisors (78049422705).

87861801615 is a wasteful number, since it uses less digits than its factorization.

87861801615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10952.

The product of its (nonzero) digits is 645120, while the sum is 51.

The spelling of 87861801615 in words is "eighty-seven billion, eight hundred sixty-one million, eight hundred one thousand, six hundred fifteen".