86721689401 has 2 divisors, whose sum is σ = 86721689402. Its totient is φ = 86721689400.

The previous prime is 86721689387. The next prime is 86721689419. The reversal of 86721689401 is 10498612768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85477293225 + 1244396176 = 292365^2 + 35276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86721689401 is a prime.

It is not a weakly prime, because it can be changed into another prime (86721689441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43360844700 + 43360844701.

It is an arithmetic number, because the mean of its divisors is an integer number (43360844701).

Almost surely, 2^86721689401 is an apocalyptic number.

It is an amenable number.

86721689401 is a deficient number, since it is larger than the sum of its proper divisors (1).

86721689401 is an equidigital number, since it uses as much as digits as its factorization.

86721689401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 86721689401 in words is "eighty-six billion, seven hundred twenty-one million, six hundred eighty-nine thousand, four hundred one".