6520882978 has 4 divisors (see below), whose sum is σ = 9781324470. Its totient is φ = 3260441488.

The previous prime is 6520882969. The next prime is 6520882999. The reversal of 6520882978 is 8792880256.

It is a happy number.

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., 6164919289 + 355963689 = 78517^2 + 18867^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1630220743 + ... + 1630220746.

Almost surely, 2^6520882978 is an apocalyptic number.

6520882978 is a deficient number, since it is larger than the sum of its proper divisors (3260441492).

6520882978 is a wasteful number, since it uses less digits than its factorization.

6520882978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260441491.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The square root of 6520882978 is about 80751.9843595190. The cubic root of 6520882978 is about 1868.2520559219.

The spelling of 6520882978 in words is "six billion, five hundred twenty million, eight hundred eighty-two thousand, nine hundred seventy-eight".