97665550 has 12 divisors (see below), whose sum is σ = 181658016. Its totient is φ = 39066200.

The previous prime is 97665539. The next prime is 97665551. The reversal of 97665550 is 5556679.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 97665497 and 97665506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97665551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 976606 + ... + 976705.

It is an arithmetic number, because the mean of its divisors is an integer number (15138168).

Almost surely, 2^97665550 is an apocalyptic number.

97665550 is a deficient number, since it is larger than the sum of its proper divisors (83992466).

97665550 is a wasteful number, since it uses less digits than its factorization.

97665550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953323 (or 1953318 counting only the distinct ones).

The product of its (nonzero) digits is 283500, while the sum is 43.

The square root of 97665550 is about 9882.5882237398. The cubic root of 97665550 is about 460.5185551030.

The spelling of 97665550 in words is "ninety-seven million, six hundred sixty-five thousand, five hundred fifty".