16400945269 has 2 divisors, whose sum is σ = 16400945270. Its totient is φ = 16400945268.

The previous prime is 16400945261. The next prime is 16400945299. The reversal of 16400945269 is 96254900461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12020491044 + 4380454225 = 109638^2 + 66185^2 .

It is a cyclic number.

It is not a de Polignac number, because 16400945269 - 2³ = 16400945261 is a prime.

It is a super-2 number, since 2×16400945269² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16400945261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200472634 + 8200472635.

It is an arithmetic number, because the mean of its divisors is an integer number (8200472635).

Almost surely, 2^16400945269 is an apocalyptic number.

It is an amenable number.

16400945269 is a deficient number, since it is larger than the sum of its proper divisors (1).

16400945269 is an equidigital number, since it uses as much as digits as its factorization.

16400945269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 16400945269 in words is "sixteen billion, four hundred million, nine hundred forty-five thousand, two hundred sixty-nine".