78285747097 has 2 divisors, whose sum is σ = 78285747098. Its totient is φ = 78285747096.

The previous prime is 78285747079. The next prime is 78285747203. The reversal of 78285747097 is 79074758287.

Together with previous prime (78285747079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74537736256 + 3748010841 = 273016^2 + 61221^2 .

It is a cyclic number.

It is not a de Polignac number, because 78285747097 - 2⁷ = 78285746969 is a prime.

It is a super-2 number, since 2×78285747097² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78285747077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39142873548 + 39142873549.

It is an arithmetic number, because the mean of its divisors is an integer number (39142873549).

Almost surely, 2^78285747097 is an apocalyptic number.

It is an amenable number.

78285747097 is a deficient number, since it is larger than the sum of its proper divisors (1).

78285747097 is an equidigital number, since it uses as much as digits as its factorization.

78285747097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55319040, while the sum is 64.

The spelling of 78285747097 in words is "seventy-eight billion, two hundred eighty-five million, seven hundred forty-seven thousand, ninety-seven".