97457856581 has 8 divisors (see below), whose sum is σ = 103653414144. Its totient is φ = 91313714880.

The previous prime is 97457856571. The next prime is 97457856611. The reversal of 97457856581 is 18565875479.

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 97457856581 - 2²⁶ = 97390747717 is a prime.

It is a super-2 number, since 2×97457856581² (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 (97457856541) 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, 12850055 + ... + 12857636.

It is an arithmetic number, because the mean of its divisors is an integer number (12956676768).

Almost surely, 2^97457856581 is an apocalyptic number.

It is an amenable number.

97457856581 is a deficient number, since it is larger than the sum of its proper divisors (6195557563).

97457856581 is a wasteful number, since it uses less digits than its factorization.

97457856581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25707931.

The product of its digits is 84672000, while the sum is 65.

The spelling of 97457856581 in words is "ninety-seven billion, four hundred fifty-seven million, eight hundred fifty-six thousand, five hundred eighty-one".