645524255452366 has 4 divisors (see below), whose sum is σ = 968286383178552. Its totient is φ = 322762127726182.

The previous prime is 645524255452361. The next prime is 645524255452369. The reversal of 645524255452366 is 663254552425546.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 645524255452298 and 645524255452307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645524255452361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161381063863090 + ... + 161381063863093.

It is an arithmetic number, because the mean of its divisors is an integer number (242071595794638).

Almost surely, 2^{645524255452366} is an apocalyptic number.

645524255452366 is a deficient number, since it is larger than the sum of its proper divisors (322762127726186).

645524255452366 is a wasteful number, since it uses less digits than its factorization.

645524255452366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322762127726185.

The product of its digits is 1036800000, while the sum is 64.

The spelling of 645524255452366 in words is "six hundred forty-five trillion, five hundred twenty-four billion, two hundred fifty-five million, four hundred fifty-two thousand, three hundred sixty-six".