78335872697 has 2 divisors, whose sum is σ = 78335872698. Its totient is φ = 78335872696.

The previous prime is 78335872633. The next prime is 78335872709. The reversal of 78335872697 is 79627853387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43403888896 + 34931983801 = 208336^2 + 186901^2 .

It is an emirp because it is prime and its reverse (79627853387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78335872697 - 2⁶ = 78335872633 is a prime.

It is a super-2 number, since 2×78335872697² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78335872297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39167936348 + 39167936349.

It is an arithmetic number, because the mean of its divisors is an integer number (39167936349).

Almost surely, 2^78335872697 is an apocalyptic number.

It is an amenable number.

78335872697 is a deficient number, since it is larger than the sum of its proper divisors (1).

78335872697 is an equidigital number, since it uses as much as digits as its factorization.

78335872697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 106686720, while the sum is 65.

The spelling of 78335872697 in words is "seventy-eight billion, three hundred thirty-five million, eight hundred seventy-two thousand, six hundred ninety-seven".