6465819506 has 4 divisors (see below), whose sum is σ = 9698729262. Its totient is φ = 3232909752.

The previous prime is 6465819427. The next prime is 6465819533. The reversal of 6465819506 is 6059185646.

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., 6385448281 + 80371225 = 79909^2 + 8965^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1616454875 + ... + 1616454878.

Almost surely, 2^6465819506 is an apocalyptic number.

6465819506 is a deficient number, since it is larger than the sum of its proper divisors (3232909756).

6465819506 is a wasteful number, since it uses less digits than its factorization.

6465819506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232909755.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 6465819506 is about 80410.3196486620. The cubic root of 6465819506 is about 1862.9785692482.

The spelling of 6465819506 in words is "six billion, four hundred sixty-five million, eight hundred nineteen thousand, five hundred six".