5421318778 has 4 divisors (see below), whose sum is σ = 8131978170. Its totient is φ = 2710659388.

The previous prime is 5421318757. The next prime is 5421318779. The reversal of 5421318778 is 8778131245.

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., 3934676529 + 1486642249 = 62727^2 + 38557^2 .

It is not an unprimeable number, because it can be changed into a prime (5421318779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1355329693 + ... + 1355329696.

Almost surely, 2^5421318778 is an apocalyptic number.

5421318778 is a deficient number, since it is larger than the sum of its proper divisors (2710659392).

5421318778 is a wasteful number, since it uses less digits than its factorization.

5421318778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710659391.

The product of its digits is 376320, while the sum is 46.

The square root of 5421318778 is about 73629.6053092776. The cubic root of 5421318778 is about 1756.7163700125.

The spelling of 5421318778 in words is "five billion, four hundred twenty-one million, three hundred eighteen thousand, seven hundred seventy-eight".