997668671 has 16 divisors (see below), whose sum is σ = 1047112704. Its totient is φ = 949601184.

The previous prime is 997668653. The next prime is 997668697. The reversal of 997668671 is 176866799.

It is a cyclic number.

It is not a de Polignac number, because 997668671 - 2²² = 993474367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997668671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997668611) 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, 530585 + ... + 532461.

It is an arithmetic number, because the mean of its divisors is an integer number (65444544).

Almost surely, 2^997668671 is an apocalyptic number.

997668671 is a deficient number, since it is larger than the sum of its proper divisors (49444033).

997668671 is a wasteful number, since it uses less digits than its factorization.

997668671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230.

The product of its digits is 6858432, while the sum is 59.

The square root of 997668671 is about 31585.8935444290. The cubic root of 997668671 is about 999.2222856505. Note that the first 4 decimals are identical.

The spelling of 997668671 in words is "nine hundred ninety-seven million, six hundred sixty-eight thousand, six hundred seventy-one".