78287914669 has 2 divisors, whose sum is σ = 78287914670. Its totient is φ = 78287914668.

The previous prime is 78287914637. The next prime is 78287914687. The reversal of 78287914669 is 96641978287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78226496100 + 61418569 = 279690^2 + 7837^2 .

It is a cyclic number.

It is not a de Polignac number, because 78287914669 - 2⁵ = 78287914637 is a prime.

It is a super-2 number, since 2×78287914669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78287914609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39143957334 + 39143957335.

It is an arithmetic number, because the mean of its divisors is an integer number (39143957335).

Almost surely, 2^78287914669 is an apocalyptic number.

It is an amenable number.

78287914669 is a deficient number, since it is larger than the sum of its proper divisors (1).

78287914669 is an equidigital number, since it uses as much as digits as its factorization.

78287914669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73156608, while the sum is 67.

The spelling of 78287914669 in words is "seventy-eight billion, two hundred eighty-seven million, nine hundred fourteen thousand, six hundred sixty-nine".