66513610634 has 8 divisors (see below), whose sum is σ = 99868137348. Its totient is φ = 33224231520.

The previous prime is 66513610621. The next prime is 66513610637. The reversal of 66513610634 is 43601631566.

It can be written as a sum of positive squares in 2 ways, for example, as 63754735009 + 2758875625 = 252497^2 + 52525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 66513610591 and 66513610600.

It is not an unprimeable number, because it can be changed into a prime (66513610637) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 16284347 + ... + 16288430.

Almost surely, 2^66513610634 is an apocalyptic number.

66513610634 is a deficient number, since it is larger than the sum of its proper divisors (33354526714).

66513610634 is a wasteful number, since it uses less digits than its factorization.

66513610634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32573800.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 66513610634 in words is "sixty-six billion, five hundred thirteen million, six hundred ten thousand, six hundred thirty-four".