645632653562 has 32 divisors (see below), whose sum is σ = 1104378205392. Its totient is φ = 280434622464.

The previous prime is 645632653559. The next prime is 645632653577. The reversal of 645632653562 is 265356236546.

It can be written as a sum of positive squares in 8 ways, for example, as 383172142081 + 262460511481 = 619009^2 + 512309^2 .

It is a super-2 number, since 2×645632653562² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6749138 + ... + 6844130.

Almost surely, 2^645632653562 is an apocalyptic number.

645632653562 is a deficient number, since it is larger than the sum of its proper divisors (458745551830).

645632653562 is a wasteful number, since it uses less digits than its factorization.

645632653562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110402.

The product of its digits is 23328000, while the sum is 53.

The spelling of 645632653562 in words is "six hundred forty-five billion, six hundred thirty-two million, six hundred fifty-three thousand, five hundred sixty-two".