645750146402 has 4 divisors (see below), whose sum is σ = 968625219606. Its totient is φ = 322875073200.

The previous prime is 645750146387. The next prime is 645750146443. The reversal of 645750146402 is 204641057546.

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

It can be written as a sum of positive squares in only one way, i.e., 645742423561 + 7722841 = 803581^2 + 2779^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 161437536599 + ... + 161437536602.

Almost surely, 2^645750146402 is an apocalyptic number.

645750146402 is a deficient number, since it is larger than the sum of its proper divisors (322875073204).

645750146402 is a wasteful number, since it uses less digits than its factorization.

645750146402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322875073203.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 645750146402 in words is "six hundred forty-five billion, seven hundred fifty million, one hundred forty-six thousand, four hundred two".