87665468721 has 4 divisors (see below), whose sum is σ = 116887291632. Its totient is φ = 58443645812.

The previous prime is 87665468719. The next prime is 87665468747. The reversal of 87665468721 is 12786456678.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87665468721 - 2¹ = 87665468719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87665468701) 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, 14610911451 + ... + 14610911456.

It is an arithmetic number, because the mean of its divisors is an integer number (29221822908).

Almost surely, 2^87665468721 is an apocalyptic number.

It is an amenable number.

87665468721 is a deficient number, since it is larger than the sum of its proper divisors (29221822911).

87665468721 is a wasteful number, since it uses less digits than its factorization.

87665468721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29221822910.

The product of its digits is 27095040, while the sum is 60.

The spelling of 87665468721 in words is "eighty-seven billion, six hundred sixty-five million, four hundred sixty-eight thousand, seven hundred twenty-one".