645150683545 has 4 divisors (see below), whose sum is σ = 774180820260. Its totient is φ = 516120546832.

The previous prime is 645150683543. The next prime is 645150683623. The reversal of 645150683545 is 545386051546.

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 277889231104 + 367261452441 = 527152^2 + 606021^2 .

It is a cyclic number.

It is not a de Polignac number, because 645150683545 - 2¹ = 645150683543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645150683492 and 645150683501.

It is not an unprimeable number, because it can be changed into a prime (645150683543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64515068350 + ... + 64515068359.

It is an arithmetic number, because the mean of its divisors is an integer number (193545205065).

Almost surely, 2^645150683545 is an apocalyptic number.

It is an amenable number.

645150683545 is a deficient number, since it is larger than the sum of its proper divisors (129030136715).

645150683545 is a wasteful number, since it uses less digits than its factorization.

645150683545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129030136714.

The product of its (nonzero) digits is 8640000, while the sum is 52.

The spelling of 645150683545 in words is "six hundred forty-five billion, one hundred fifty million, six hundred eighty-three thousand, five hundred forty-five".