16164973949 has 2 divisors, whose sum is σ = 16164973950. Its totient is φ = 16164973948.

The previous prime is 16164973939. The next prime is 16164974041. The reversal of 16164973949 is 94937946161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9207745849 + 6957228100 = 95957^2 + 83410^2 .

It is a cyclic number.

It is not a de Polignac number, because 16164973949 - 2²⁴ = 16148196733 is a prime.

It is a super-2 number, since 2×16164973949² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16164973939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8082486974 + 8082486975.

It is an arithmetic number, because the mean of its divisors is an integer number (8082486975).

Almost surely, 2^16164973949 is an apocalyptic number.

It is an amenable number.

16164973949 is a deficient number, since it is larger than the sum of its proper divisors (1).

16164973949 is an equidigital number, since it uses as much as digits as its factorization.

16164973949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 59.

The spelling of 16164973949 in words is "sixteen billion, one hundred sixty-four million, nine hundred seventy-three thousand, nine hundred forty-nine".