985718591651 has 2 divisors, whose sum is σ = 985718591652. Its totient is φ = 985718591650.

The previous prime is 985718591621. The next prime is 985718591659. The reversal of 985718591651 is 156195817589.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 985718591651 - 2²² = 985714397347 is a prime.

It is a super-2 number, since 2×985718591651² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (985718591659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492859295825 + 492859295826.

It is an arithmetic number, because the mean of its divisors is an integer number (492859295826).

Almost surely, 2^985718591651 is an apocalyptic number.

985718591651 is a deficient number, since it is larger than the sum of its proper divisors (1).

985718591651 is an equidigital number, since it uses as much as digits as its factorization.

985718591651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216000, while the sum is 65.

The spelling of 985718591651 in words is "nine hundred eighty-five billion, seven hundred eighteen million, five hundred ninety-one thousand, six hundred fifty-one".