6480735621 has 4 divisors (see below), whose sum is σ = 8640980832. Its totient is φ = 4320490412.

The previous prime is 6480735619. The next prime is 6480735683. The reversal of 6480735621 is 1265370846.

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 6480735621 - 2¹ = 6480735619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6480735601) 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, 1080122601 + ... + 1080122606.

It is an arithmetic number, because the mean of its divisors is an integer number (2160245208).

Almost surely, 2^6480735621 is an apocalyptic number.

It is an amenable number.

6480735621 is a deficient number, since it is larger than the sum of its proper divisors (2160245211).

6480735621 is a wasteful number, since it uses less digits than its factorization.

6480735621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160245210.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 6480735621 is about 80503.0162229963. The cubic root of 6480735621 is about 1864.4100486030.

The spelling of 6480735621 in words is "six billion, four hundred eighty million, seven hundred thirty-five thousand, six hundred twenty-one".