97766665 has 4 divisors (see below), whose sum is σ = 117320004. Its totient is φ = 78213328.

The previous prime is 97766663. The next prime is 97766671. The reversal of 97766665 is 56666779.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59028489 + 38738176 = 7683^2 + 6224^2 .

It is a cyclic number.

It is not a de Polignac number, because 97766665 - 2¹ = 97766663 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (97766663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9776662 + ... + 9776671.

It is an arithmetic number, because the mean of its divisors is an integer number (29330001).

Almost surely, 2^97766665 is an apocalyptic number.

It is an amenable number.

97766665 is a deficient number, since it is larger than the sum of its proper divisors (19553339).

97766665 is a wasteful number, since it uses less digits than its factorization.

97766665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19553338.

The product of its digits is 2857680, while the sum is 52.

The square root of 97766665 is about 9887.7027160003. The cubic root of 97766665 is about 460.6774281582.

The spelling of 97766665 in words is "ninety-seven million, seven hundred sixty-six thousand, six hundred sixty-five".