6618997 has 16 divisors (see below), whose sum is σ = 8381952. Its totient is φ = 5076720.

The previous prime is 6618991. The next prime is 6619021. The reversal of 6618997 is 7998166.

It is a de Polignac number, because none of the positive numbers 2^k-6618997 is a prime.

It is a super-2 number, since 2×6618997² = 87622242572018, 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 (6618991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4518 + ... + 5800.

It is an arithmetic number, because the mean of its divisors is an integer number (523872).

Almost surely, 2^6618997 is an apocalyptic number.

6618997 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

6618997 is a deficient number, since it is larger than the sum of its proper divisors (1762955).

6618997 is a wasteful number, since it uses less digits than its factorization.

6618997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368.

The product of its digits is 163296, while the sum is 46.

The square root of 6618997 is about 2572.7411451602. The cubic root of 6618997 is about 187.7575435665.

The spelling of 6618997 in words is "six million, six hundred eighteen thousand, nine hundred ninety-seven".