11946405649 has 2 divisors, whose sum is σ = 11946405650. Its totient is φ = 11946405648.

The previous prime is 11946405577. The next prime is 11946405661. The reversal of 11946405649 is 94650464911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7236054225 + 4710351424 = 85065^2 + 68632^2 .

It is an emirp because it is prime and its reverse (94650464911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11946405649 - 2¹³ = 11946397457 is a prime.

It is a super-2 number, since 2×11946405649² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11946405349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5973202824 + 5973202825.

It is an arithmetic number, because the mean of its divisors is an integer number (5973202825).

Almost surely, 2^11946405649 is an apocalyptic number.

It is an amenable number.

11946405649 is a deficient number, since it is larger than the sum of its proper divisors (1).

11946405649 is an equidigital number, since it uses as much as digits as its factorization.

11946405649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 11946405649 in words is "eleven billion, nine hundred forty-six million, four hundred five thousand, six hundred forty-nine".