74278159645 has 8 divisors (see below), whose sum is σ = 89228519640. Its totient is φ = 59359375680.

The previous prime is 74278159609. The next prime is 74278159691. The reversal of 74278159645 is 54695187247.

It can be written as a sum of positive squares in 4 ways, for example, as 1415414884 + 72862744761 = 37622^2 + 269931^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 74278159645 - 2¹⁹ = 74277635357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74278159645.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 7888830 + ... + 7898239.

It is an arithmetic number, because the mean of its divisors is an integer number (11153564955).

Almost surely, 2^74278159645 is an apocalyptic number.

It is an amenable number.

74278159645 is a deficient number, since it is larger than the sum of its proper divisors (14950359995).

74278159645 is a wasteful number, since it uses less digits than its factorization.

74278159645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15788015.

The product of its digits is 16934400, while the sum is 58.

The spelling of 74278159645 in words is "seventy-four billion, two hundred seventy-eight million, one hundred fifty-nine thousand, six hundred forty-five".