42777700778 has 4 divisors (see below), whose sum is σ = 64166551170. Its totient is φ = 21388850388.

The previous prime is 42777700751. The next prime is 42777700783. The reversal of 42777700778 is 87700777724.

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., 35176127809 + 7601572969 = 187553^2 + 87187^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694425193 + ... + 10694425196.

Almost surely, 2^42777700778 is an apocalyptic number.

42777700778 is a deficient number, since it is larger than the sum of its proper divisors (21388850392).

42777700778 is a wasteful number, since it uses less digits than its factorization.

42777700778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21388850391.

The product of its (nonzero) digits is 7529536, while the sum is 56.

The spelling of 42777700778 in words is "forty-two billion, seven hundred seventy-seven million, seven hundred thousand, seven hundred seventy-eight".