74278159665 has 8 divisors (see below), whose sum is σ = 118845055488. Its totient is φ = 39615018480.

The previous prime is 74278159609. The next prime is 74278159691. The reversal of 74278159665 is 56695187247.

It is a happy number.

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

It is not a de Polignac number, because 74278159665 - 2¹⁶ = 74278094129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74278159599 and 74278159608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2475938641 + ... + 2475938670.

It is an arithmetic number, because the mean of its divisors is an integer number (14855631936).

Almost surely, 2^74278159665 is an apocalyptic number.

It is an amenable number.

74278159665 is a deficient number, since it is larger than the sum of its proper divisors (44566895823).

74278159665 is a wasteful number, since it uses less digits than its factorization.

74278159665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4951877319.

The product of its digits is 25401600, while the sum is 60.

The spelling of 74278159665 in words is "seventy-four billion, two hundred seventy-eight million, one hundred fifty-nine thousand, six hundred sixty-five".