97787164457 has 4 divisors (see below), whose sum is σ = 97791278340. Its totient is φ = 97783050576.

The previous prime is 97787164411. The next prime is 97787164459. The reversal of 97787164457 is 75446178779.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75446178779 = 43913 ⋅1718083.

It can be written as a sum of positive squares in 2 ways, for example, as 45804988441 + 51982176016 = 214021^2 + 227996^2 .

It is a cyclic number.

It is not a de Polignac number, because 97787164457 - 2¹⁸ = 97786902313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97787164393 and 97787164402.

It is not an unprimeable number, because it can be changed into a prime (97787164459) 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, 2021078 + ... + 2068895.

It is an arithmetic number, because the mean of its divisors is an integer number (24447819585).

Almost surely, 2^97787164457 is an apocalyptic number.

It is an amenable number.

97787164457 is a deficient number, since it is larger than the sum of its proper divisors (4113883).

97787164457 is a wasteful number, since it uses less digits than its factorization.

97787164457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113882.

The product of its digits is 82978560, while the sum is 65.

The spelling of 97787164457 in words is "ninety-seven billion, seven hundred eighty-seven million, one hundred sixty-four thousand, four hundred fifty-seven".