6466780802 has 4 divisors (see below), whose sum is σ = 9700171206. Its totient is φ = 3233390400.

The previous prime is 6466780799. The next prime is 6466780819. The reversal of 6466780802 is 2080876646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2080876646 = 2 ⋅1040438323.

It can be written as a sum of positive squares in only one way, i.e., 3469327801 + 2997453001 = 58901^2 + 54749^2 .

It is a super-2 number, since 2×6466780802² = 83638507882231526408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1616695199 + ... + 1616695202.

Almost surely, 2^6466780802 is an apocalyptic number.

6466780802 is a deficient number, since it is larger than the sum of its proper divisors (3233390404).

6466780802 is a wasteful number, since it uses less digits than its factorization.

6466780802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233390403.

The product of its (nonzero) digits is 774144, while the sum is 47.

The square root of 6466780802 is about 80416.2968682344. The cubic root of 6466780802 is about 1863.0708898530.

The spelling of 6466780802 in words is "six billion, four hundred sixty-six million, seven hundred eighty thousand, eight hundred two".