6531370645 has 8 divisors (see below), whose sum is σ = 7838220600. Its totient is φ = 5224712640.

The previous prime is 6531370613. The next prime is 6531370723. The reversal of 6531370645 is 5460731356.

It can be written as a sum of positive squares in 4 ways, for example, as 783608049 + 5747762596 = 27993^2 + 75814^2 .

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

It is not a de Polignac number, because 6531370645 - 2⁵ = 6531370613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6531370598 and 6531370607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42331 + ... + 121879.

It is an arithmetic number, because the mean of its divisors is an integer number (979777575).

Almost surely, 2^6531370645 is an apocalyptic number.

It is an amenable number.

6531370645 is a deficient number, since it is larger than the sum of its proper divisors (1306849955).

6531370645 is a wasteful number, since it uses less digits than its factorization.

6531370645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95975.

The product of its (nonzero) digits is 226800, while the sum is 40.

The square root of 6531370645 is about 80816.8957891851. The cubic root of 6531370645 is about 1869.2531018750.

The spelling of 6531370645 in words is "six billion, five hundred thirty-one million, three hundred seventy thousand, six hundred forty-five".