74278159691 has 2 divisors, whose sum is σ = 74278159692. Its totient is φ = 74278159690.

The previous prime is 74278159609. The next prime is 74278159699. The reversal of 74278159691 is 19695187247.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74278159691 - 2¹⁴ = 74278143307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74278159691.

It is not a weakly prime, because it can be changed into another prime (74278159699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37139079845 + 37139079846.

It is an arithmetic number, because the mean of its divisors is an integer number (37139079846).

Almost surely, 2^74278159691 is an apocalyptic number.

74278159691 is a deficient number, since it is larger than the sum of its proper divisors (1).

74278159691 is an equidigital number, since it uses as much as digits as its factorization.

74278159691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 59.

The spelling of 74278159691 in words is "seventy-four billion, two hundred seventy-eight million, one hundred fifty-nine thousand, six hundred ninety-one".