78168523 has 2 divisors, whose sum is σ = 78168524. Its totient is φ = 78168522.

The previous prime is 78168437. The next prime is 78168547. The reversal of 78168523 is 32586187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78168523 - 2⁹ = 78168011 is a prime.

It is a super-2 number, since 2×78168523² = 12220635976003058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78168553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39084261 + 39084262.

It is an arithmetic number, because the mean of its divisors is an integer number (39084262).

Almost surely, 2^78168523 is an apocalyptic number.

78168523 is a deficient number, since it is larger than the sum of its proper divisors (1).

78168523 is an equidigital number, since it uses as much as digits as its factorization.

78168523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 78168523 is about 8841.2964547062. The cubic root of 78168523 is about 427.5733567675.

The spelling of 78168523 in words is "seventy-eight million, one hundred sixty-eight thousand, five hundred twenty-three".