78561731674 has 4 divisors (see below), whose sum is σ = 117842597514. Its totient is φ = 39280865836.

The previous prime is 78561731671. The next prime is 78561731681. The reversal of 78561731674 is 47613716587.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 78480100449 + 81631225 = 280143^2 + 9035^2 .

It is not an unprimeable number, because it can be changed into a prime (78561731671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19640432917 + ... + 19640432920.

Almost surely, 2^78561731674 is an apocalyptic number.

78561731674 is a deficient number, since it is larger than the sum of its proper divisors (39280865840).

78561731674 is a wasteful number, since it uses less digits than its factorization.

78561731674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39280865839.

The product of its digits is 5927040, while the sum is 55.

The spelling of 78561731674 in words is "seventy-eight billion, five hundred sixty-one million, seven hundred thirty-one thousand, six hundred seventy-four".