645246523 has 8 divisors (see below), whose sum is σ = 647764416. Its totient is φ = 642734400.

The previous prime is 645246521. The next prime is 645246527. The reversal of 645246523 is 325642546.

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

It is a cyclic number.

It is not a de Polignac number, because 645246523 - 2¹ = 645246521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645246521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434943 + ... + 436423.

It is an arithmetic number, because the mean of its divisors is an integer number (80970552).

Almost surely, 2^645246523 is an apocalyptic number.

645246523 is a deficient number, since it is larger than the sum of its proper divisors (2517893).

645246523 is a wasteful number, since it uses less digits than its factorization.

645246523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885.

The product of its digits is 172800, while the sum is 37.

The square root of 645246523 is about 25401.7031515605. The cubic root of 645246523 is about 864.1223226981.

It can be divided in two parts, 6452 and 46523, that added together give a triangular number (52975 = T₃₂₅).

The spelling of 645246523 in words is "six hundred forty-five million, two hundred forty-six thousand, five hundred twenty-three".