97666654321 has 8 divisors (see below), whose sum is σ = 103425564744. Its totient is φ = 91909278720.

The previous prime is 97666654301. The next prime is 97666654363. The reversal of 97666654321 is 12345666679.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16462173025 + 81204481296 = 128305^2 + 284964^2 .

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

It is not a de Polignac number, because 97666654321 - 2³¹ = 95519170673 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 (97666654301) by changing a digit.

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, 251380 + ... + 508453.

It is an arithmetic number, because the mean of its divisors is an integer number (12928195593).

Almost surely, 2^97666654321 is an apocalyptic number.

It is an amenable number.

97666654321 is a deficient number, since it is larger than the sum of its proper divisors (5758910423).

97666654321 is a wasteful number, since it uses less digits than its factorization.

97666654321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767411.

The product of its digits is 9797760, while the sum is 55.

The spelling of 97666654321 in words is "ninety-seven billion, six hundred sixty-six million, six hundred fifty-four thousand, three hundred twenty-one".