74278159609 has 2 divisors, whose sum is σ = 74278159610. Its totient is φ = 74278159608.

The previous prime is 74278159603. The next prime is 74278159691. The reversal of 74278159609 is 90695187247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58239203584 + 16038956025 = 241328^2 + 126645^2 .

It is a cyclic number.

It is not a de Polignac number, because 74278159609 - 2¹¹ = 74278157561 is a prime.

It is a super-3 number, since 3×74278159609³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (74278159603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37139079804 + 37139079805.

It is an arithmetic number, because the mean of its divisors is an integer number (37139079805).

Almost surely, 2^74278159609 is an apocalyptic number.

It is an amenable number.

74278159609 is a deficient number, since it is larger than the sum of its proper divisors (1).

74278159609 is an equidigital number, since it uses as much as digits as its factorization.

74278159609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 74278159609 in words is "seventy-four billion, two hundred seventy-eight million, one hundred fifty-nine thousand, six hundred nine".