97809566 has 4 divisors (see below), whose sum is σ = 146714352. Its totient is φ = 48904782.

The previous prime is 97809497. The next prime is 97809571. The reversal of 97809566 is 66590879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66590879 = 163 ⋅408533.

It is a super-2 number, since 2×97809566² = 19133422402216712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24452390 + ... + 24452393.

It is an arithmetic number, because the mean of its divisors is an integer number (36678588).

Almost surely, 2^97809566 is an apocalyptic number.

97809566 is a deficient number, since it is larger than the sum of its proper divisors (48904786).

97809566 is a wasteful number, since it uses less digits than its factorization.

97809566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48904785.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 97809566 is about 9889.8718899691. The cubic root of 97809566 is about 460.7448016071.

The spelling of 97809566 in words is "ninety-seven million, eight hundred nine thousand, five hundred sixty-six".