78374596609 has 4 divisors (see below), whose sum is σ = 78596621316. Its totient is φ = 78152571904.

The previous prime is 78374596577. The next prime is 78374596621. The reversal of 78374596609 is 90669547387.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90669547387 = 251323 ⋅360769.

It can be written as a sum of positive squares in 2 ways, for example, as 23699063025 + 54675533584 = 153945^2 + 233828^2 .

It is a cyclic number.

It is not a de Polignac number, because 78374596609 - 2⁵ = 78374596577 is a prime.

It is a super-2 number, since 2×78374596609² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78374596669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111011824 + ... + 111012529.

It is an arithmetic number, because the mean of its divisors is an integer number (19649155329).

Almost surely, 2^78374596609 is an apocalyptic number.

It is an amenable number.

78374596609 is a deficient number, since it is larger than the sum of its proper divisors (222024707).

78374596609 is a wasteful number, since it uses less digits than its factorization.

78374596609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222024706.

The product of its (nonzero) digits is 68584320, while the sum is 64.

The spelling of 78374596609 in words is "seventy-eight billion, three hundred seventy-four million, five hundred ninety-six thousand, six hundred nine".