42753456778 has 4 divisors (see below), whose sum is σ = 64130185170. Its totient is φ = 21376728388.

The previous prime is 42753456749. The next prime is 42753456847. The reversal of 42753456778 is 87765435724.

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., 25723989769 + 17029467009 = 160387^2 + 130497^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688364193 + ... + 10688364196.

Almost surely, 2^42753456778 is an apocalyptic number.

42753456778 is a deficient number, since it is larger than the sum of its proper divisors (21376728392).

42753456778 is a wasteful number, since it uses less digits than its factorization.

42753456778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21376728391.

The product of its digits is 39513600, while the sum is 58.

The spelling of 42753456778 in words is "forty-two billion, seven hundred fifty-three million, four hundred fifty-six thousand, seven hundred seventy-eight".