6506639745 has 8 divisors (see below), whose sum is σ = 10410623616. Its totient is φ = 3470207856.

The previous prime is 6506639731. The next prime is 6506639747. The reversal of 6506639745 is 5479366056.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6506639745 - 2¹³ = 6506631553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6506639747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216887977 + ... + 216888006.

It is an arithmetic number, because the mean of its divisors is an integer number (1301327952).

Almost surely, 2^6506639745 is an apocalyptic number.

It is an amenable number.

6506639745 is a deficient number, since it is larger than the sum of its proper divisors (3903983871).

6506639745 is a wasteful number, since it uses less digits than its factorization.

6506639745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433775991.

The product of its (nonzero) digits is 4082400, while the sum is 51.

The square root of 6506639745 is about 80663.7449229826. The cubic root of 6506639745 is about 1866.8908217034.

The spelling of 6506639745 in words is "six billion, five hundred six million, six hundred thirty-nine thousand, seven hundred forty-five".