6503921601 has 4 divisors (see below), whose sum is σ = 8671895472. Its totient is φ = 4335947732.

The previous prime is 6503921573. The next prime is 6503921663. The reversal of 6503921601 is 1061293056.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6503921601 - 2⁶ = 6503921537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6503921201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1083986931 + ... + 1083986936.

It is an arithmetic number, because the mean of its divisors is an integer number (2167973868).

Almost surely, 2^6503921601 is an apocalyptic number.

It is an amenable number.

6503921601 is a deficient number, since it is larger than the sum of its proper divisors (2167973871).

6503921601 is a wasteful number, since it uses less digits than its factorization.

6503921601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167973870.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 6503921601 is about 80646.8945527353. The cubic root of 6503921601 is about 1866.6308214028.

The spelling of 6503921601 in words is "six billion, five hundred three million, nine hundred twenty-one thousand, six hundred one".