6491405045 has 4 divisors (see below), whose sum is σ = 7789686060. Its totient is φ = 5193124032.

The previous prime is 6491405027. The next prime is 6491405051. The reversal of 6491405045 is 5405041946.

6491405045 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5405041946 = 2 ⋅2702520973.

It can be written as a sum of positive squares in 2 ways, for example, as 1324814404 + 5166590641 = 36398^2 + 71879^2 .

It is a cyclic number.

It is not a de Polignac number, because 6491405045 - 2⁶ = 6491404981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649140500 + ... + 649140509.

It is an arithmetic number, because the mean of its divisors is an integer number (1947421515).

Almost surely, 2^6491405045 is an apocalyptic number.

It is an amenable number.

6491405045 is a deficient number, since it is larger than the sum of its proper divisors (1298281015).

6491405045 is a wasteful number, since it uses less digits than its factorization.

6491405045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298281014.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 6491405045 is about 80569.2562023505. The cubic root of 6491405045 is about 1865.4326318454.

The spelling of 6491405045 in words is "six billion, four hundred ninety-one million, four hundred five thousand, forty-five".