6631531345 has 4 divisors (see below), whose sum is σ = 7957837620. Its totient is φ = 5305225072.

The previous prime is 6631531303. The next prime is 6631531363. The reversal of 6631531345 is 5431351366.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3273212944 + 3358318401 = 57212^2 + 57951^2 .

It is a cyclic number.

It is not a de Polignac number, because 6631531345 - 2⁷ = 6631531217 is a prime.

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, 663153130 + ... + 663153139.

It is an arithmetic number, because the mean of its divisors is an integer number (1989459405).

Almost surely, 2^6631531345 is an apocalyptic number.

It is an amenable number.

6631531345 is a deficient number, since it is larger than the sum of its proper divisors (1326306275).

6631531345 is a wasteful number, since it uses less digits than its factorization.

6631531345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326306274.

The product of its digits is 97200, while the sum is 37.

The square root of 6631531345 is about 81434.2148301314. The cubic root of 6631531345 is about 1878.7598718359.

The spelling of 6631531345 in words is "six billion, six hundred thirty-one million, five hundred thirty-one thousand, three hundred forty-five".