16400938249 has 2 divisors, whose sum is σ = 16400938250. Its totient is φ = 16400938248.

The previous prime is 16400938199. The next prime is 16400938271. The reversal of 16400938249 is 94283900461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11975362624 + 4425575625 = 109432^2 + 66525^2 .

It is a cyclic number.

It is not a de Polignac number, because 16400938249 - 2³¹ = 14253454601 is a prime.

It is a super-2 number, since 2×16400938249² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16400938199 and 16400938208.

It is not a weakly prime, because it can be changed into another prime (16400938289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200469124 + 8200469125.

It is an arithmetic number, because the mean of its divisors is an integer number (8200469125).

Almost surely, 2^16400938249 is an apocalyptic number.

It is an amenable number.

16400938249 is a deficient number, since it is larger than the sum of its proper divisors (1).

16400938249 is an equidigital number, since it uses as much as digits as its factorization.

16400938249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 16400938249 in words is "sixteen billion, four hundred million, nine hundred thirty-eight thousand, two hundred forty-nine".