97818327509 has 4 divisors (see below), whose sum is σ = 111792374304. Its totient is φ = 83844280716.

The previous prime is 97818327493. The next prime is 97818327511. The reversal of 97818327509 is 90572381879.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 97818327509 - 2⁴ = 97818327493 is a prime.

It is a super-2 number, since 2×97818327509² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97818527509) 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, 6987023387 + ... + 6987023400.

It is an arithmetic number, because the mean of its divisors is an integer number (27948093576).

Almost surely, 2^97818327509 is an apocalyptic number.

It is an amenable number.

97818327509 is a deficient number, since it is larger than the sum of its proper divisors (13974046795).

97818327509 is a wasteful number, since it uses less digits than its factorization.

97818327509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13974046794.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 97818327509 in words is "ninety-seven billion, eight hundred eighteen million, three hundred twenty-seven thousand, five hundred nine".