86721640973 has 16 divisors (see below), whose sum is σ = 96018037632. Its totient is φ = 77662536000.

The previous prime is 86721640961. The next prime is 86721640997. The reversal of 86721640973 is 37904612768.

It is a cyclic number.

It is not a de Polignac number, because 86721640973 - 2⁶ = 86721640909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86721640913) 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, 901583 + ... + 993123.

It is an arithmetic number, because the mean of its divisors is an integer number (6001127352).

Almost surely, 2^86721640973 is an apocalyptic number.

It is an amenable number.

86721640973 is a deficient number, since it is larger than the sum of its proper divisors (9296396659).

86721640973 is a wasteful number, since it uses less digits than its factorization.

86721640973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92836.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 86721640973 in words is "eighty-six billion, seven hundred twenty-one million, six hundred forty thousand, nine hundred seventy-three".