997437566 has 16 divisors (see below), whose sum is σ = 1667543760. Its totient is φ = 444677760.

The previous prime is 997437559. The next prime is 997437577. The reversal of 997437566 is 665734799.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771365 + ... + 772656.

It is an arithmetic number, because the mean of its divisors is an integer number (104221485).

Almost surely, 2^997437566 is an apocalyptic number.

997437566 is a deficient number, since it is larger than the sum of its proper divisors (670106194).

997437566 is a wasteful number, since it uses less digits than its factorization.

997437566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544059.

The product of its digits is 8573040, while the sum is 56.

The square root of 997437566 is about 31582.2349747449. The cubic root of 997437566 is about 999.1451247299.

The spelling of 997437566 in words is "nine hundred ninety-seven million, four hundred thirty-seven thousand, five hundred sixty-six".