11646921787 has 2 divisors, whose sum is σ = 11646921788. Its totient is φ = 11646921786.

The previous prime is 11646921763. The next prime is 11646921817. The reversal of 11646921787 is 78712964611.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11646921787 - 2⁷ = 11646921659 is a prime.

It is a super-2 number, since 2×11646921787² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11646921287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5823460893 + 5823460894.

It is an arithmetic number, because the mean of its divisors is an integer number (5823460894).

Almost surely, 2^11646921787 is an apocalyptic number.

11646921787 is a deficient number, since it is larger than the sum of its proper divisors (1).

11646921787 is an equidigital number, since it uses as much as digits as its factorization.

11646921787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 52.

The spelling of 11646921787 in words is "eleven billion, six hundred forty-six million, nine hundred twenty-one thousand, seven hundred eighty-seven".