645486027523 has 8 divisors (see below), whose sum is σ = 679533897920. Its totient is φ = 611445649320.

The previous prime is 645486027517. The next prime is 645486027583. The reversal of 645486027523 is 325720684546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645486027523 is a prime.

It is a super-2 number, since 2×645486027523² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645486027583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1695765 + ... + 2041222.

It is an arithmetic number, because the mean of its divisors is an integer number (84941737240).

Almost surely, 2^645486027523 is an apocalyptic number.

645486027523 is a deficient number, since it is larger than the sum of its proper divisors (34047870397).

645486027523 is a wasteful number, since it uses less digits than its factorization.

645486027523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746097.

The product of its (nonzero) digits is 9676800, while the sum is 52.

The spelling of 645486027523 in words is "six hundred forty-five billion, four hundred eighty-six million, twenty-seven thousand, five hundred twenty-three".