86661742499 has 2 divisors, whose sum is σ = 86661742500. Its totient is φ = 86661742498.

The previous prime is 86661742493. The next prime is 86661742529. The reversal of 86661742499 is 99424716668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86661742499 - 2¹⁶ = 86661676963 is a prime.

It is a super-2 number, since 2×86661742499² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86661742493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43330871249 + 43330871250.

It is an arithmetic number, because the mean of its divisors is an integer number (43330871250).

Almost surely, 2^86661742499 is an apocalyptic number.

86661742499 is a deficient number, since it is larger than the sum of its proper divisors (1).

86661742499 is an equidigital number, since it uses as much as digits as its factorization.

86661742499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 62.

The spelling of 86661742499 in words is "eighty-six billion, six hundred sixty-one million, seven hundred forty-two thousand, four hundred ninety-nine".