86721640983 has 28 divisors (see below), whose sum is σ = 137671411968. Its totient is φ = 54413570880.

The previous prime is 86721640961. The next prime is 86721640997. The reversal of 86721640983 is 38904612768.

86721640983 is a `hidden beast` number, since 86 + 72 + 16 + 409 + 83 = 666.

It is not a de Polignac number, because 86721640983 - 2¹² = 86721636887 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 27 ways as a sum of consecutive naturals, for example, 3486423 + ... + 3511208.

Almost surely, 2^86721640983 is an apocalyptic number.

86721640983 is a deficient number, since it is larger than the sum of its proper divisors (50949770985).

86721640983 is an equidigital number, since it uses as much as digits as its factorization.

86721640983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997666 (or 6997651 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 86721640983 in words is "eighty-six billion, seven hundred twenty-one million, six hundred forty thousand, nine hundred eighty-three".