78163537 has 2 divisors, whose sum is σ = 78163538. Its totient is φ = 78163536.

The previous prime is 78163531. The next prime is 78163541. The reversal of 78163537 is 73536187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78163281 + 256 = 8841^2 + 16^2 .

It is an emirp because it is prime and its reverse (73536187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78163537 - 2⁷ = 78163409 is a prime.

It is a super-2 number, since 2×78163537² = 12219077032700738, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78163537.

It is not a weakly prime, because it can be changed into another prime (78163531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39081768 + 39081769.

It is an arithmetic number, because the mean of its divisors is an integer number (39081769).

Almost surely, 2^78163537 is an apocalyptic number.

It is an amenable number.

78163537 is a deficient number, since it is larger than the sum of its proper divisors (1).

78163537 is an equidigital number, since it uses as much as digits as its factorization.

78163537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 78163537 is about 8841.0144779884. The cubic root of 78163537 is about 427.5642656141.

The spelling of 78163537 in words is "seventy-eight million, one hundred sixty-three thousand, five hundred thirty-seven".