66446748636 has 48 divisors (see below), whose sum is σ = 157080000000. Its totient is φ = 21858100992.

The previous prime is 66446748631. The next prime is 66446748727. The reversal of 66446748636 is 63684764466.

It is a self number, because there is not a number n which added to its sum of digits gives 66446748636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66446748631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2110740 + ... + 2141988.

It is an arithmetic number, because the mean of its divisors is an integer number (3272500000).

Almost surely, 2^66446748636 is an apocalyptic number.

It is an amenable number.

66446748636 is an abundant number, since it is smaller than the sum of its proper divisors (90633251364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66446748636 is a wasteful number, since it uses less digits than its factorization.

66446748636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33578 (or 33576 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 60.

The spelling of 66446748636 in words is "sixty-six billion, four hundred forty-six million, seven hundred forty-eight thousand, six hundred thirty-six".