6515906066 has 4 divisors (see below), whose sum is σ = 9773859102. Its totient is φ = 3257953032.

The previous prime is 6515906063. The next prime is 6515906107. The reversal of 6515906066 is 6606095156.

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., 4068526225 + 2447379841 = 63785^2 + 49471^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6515906063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1628976515 + ... + 1628976518.

Almost surely, 2^6515906066 is an apocalyptic number.

6515906066 is a deficient number, since it is larger than the sum of its proper divisors (3257953036).

6515906066 is a wasteful number, since it uses less digits than its factorization.

6515906066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257953035.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 6515906066 is about 80721.1624420759. The cubic root of 6515906066 is about 1867.7766349992.

The spelling of 6515906066 in words is "six billion, five hundred fifteen million, nine hundred six thousand, sixty-six".