78166453 has 2 divisors, whose sum is σ = 78166454. Its totient is φ = 78166452.

The previous prime is 78166441. The next prime is 78166463. The reversal of 78166453 is 35466187.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44328964 + 33837489 = 6658^2 + 5817^2 .

It is an emirp because it is prime and its reverse (35466187) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78166453 is a prime.

It is a super-2 number, since 2×78166453² = 12219988749202418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78166433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39083226 + 39083227.

It is an arithmetic number, because the mean of its divisors is an integer number (39083227).

Almost surely, 2^78166453 is an apocalyptic number.

It is an amenable number.

78166453 is a deficient number, since it is larger than the sum of its proper divisors (1).

78166453 is an equidigital number, since it uses as much as digits as its factorization.

78166453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 78166453 is about 8841.1793896516. The cubic root of 78166453 is about 427.5695825089.

The spelling of 78166453 in words is "seventy-eight million, one hundred sixty-six thousand, four hundred fifty-three".