645142562 has 4 divisors (see below), whose sum is σ = 967713846. Its totient is φ = 322571280.

The previous prime is 645142559. The next prime is 645142567. The reversal of 645142562 is 265241546.

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., 410103001 + 235039561 = 20251^2 + 15331^2 .

It is not an unprimeable number, because it can be changed into a prime (645142567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161285639 + ... + 161285642.

Almost surely, 2^645142562 is an apocalyptic number.

645142562 is a deficient number, since it is larger than the sum of its proper divisors (322571284).

645142562 is a wasteful number, since it uses less digits than its factorization.

645142562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322571283.

The product of its digits is 57600, while the sum is 35.

The square root of 645142562 is about 25399.6567299639. The cubic root of 645142562 is about 864.0759115758.

It can be divided in two parts, 64514 and 2562, that added together give a palindrome (67076).

The spelling of 645142562 in words is "six hundred forty-five million, one hundred forty-two thousand, five hundred sixty-two".