16616997 has 6 divisors (see below), whose sum is σ = 24002342. Its totient is φ = 11077992.

The previous prime is 16616983. The next prime is 16617011. The reversal of 16616997 is 79961661.

It is an interprime number because it is at equal distance from previous prime (16616983) and next prime (16617011).

It can be written as a sum of positive squares in only one way, i.e., 16208676 + 408321 = 4026^2 + 639^2 .

It is not a de Polignac number, because 16616997 - 2⁶ = 16616933 is a prime.

It is a super-2 number, since 2×16616997² = 552249178596018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16616947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 923158 + ... + 923175.

Almost surely, 2^16616997 is an apocalyptic number.

It is an amenable number.

16616997 is a deficient number, since it is larger than the sum of its proper divisors (7385345).

16616997 is a wasteful number, since it uses less digits than its factorization.

16616997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846339 (or 1846336 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 16616997 is about 4076.3950986135. The cubic root of 16616997 is about 255.1824760801.

The spelling of 16616997 in words is "sixteen million, six hundred sixteen thousand, nine hundred ninety-seven".