77374147778 has 4 divisors (see below), whose sum is σ = 116061221670. Its totient is φ = 38687073888.

The previous prime is 77374147751. The next prime is 77374147789. The reversal of 77374147778 is 87774147377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87774147377 = 7 ⋅12539163911.

It can be written as a sum of positive squares in only one way, i.e., 51923369689 + 25450778089 = 227867^2 + 159533^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77374147778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19343536943 + ... + 19343536946.

Almost surely, 2^77374147778 is an apocalyptic number.

77374147778 is a deficient number, since it is larger than the sum of its proper divisors (38687073892).

77374147778 is a wasteful number, since it uses less digits than its factorization.

77374147778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38687073891.

The product of its digits is 45177216, while the sum is 62.

The spelling of 77374147778 in words is "seventy-seven billion, three hundred seventy-four million, one hundred forty-seven thousand, seven hundred seventy-eight".