97666570649 has 8 divisors (see below), whose sum is σ = 102034726920. Its totient is φ = 93365104000.

The previous prime is 97666570633. The next prime is 97666570669. The reversal of 97666570649 is 94607566679.

It can be written as a sum of positive squares in 4 ways, for example, as 57869113600 + 39797457049 = 240560^2 + 199493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97666570649 - 2⁴ = 97666570633 is a prime.

It is a super-2 number, since 2×97666570649² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97666570609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16669412 + ... + 16675269.

It is an arithmetic number, because the mean of its divisors is an integer number (12754340865).

Almost surely, 2^97666570649 is an apocalyptic number.

It is an amenable number.

97666570649 is a deficient number, since it is larger than the sum of its proper divisors (4368156271).

97666570649 is a wasteful number, since it uses less digits than its factorization.

97666570649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33344811.

The product of its (nonzero) digits is 102876480, while the sum is 65.

The spelling of 97666570649 in words is "ninety-seven billion, six hundred sixty-six million, five hundred seventy thousand, six hundred forty-nine".