66640153604 has 24 divisors (see below), whose sum is σ = 117750651480. Its totient is φ = 32997424896.

The previous prime is 66640153603. The next prime is 66640153627. The reversal of 66640153604 is 40635104666.

It can be written as a sum of positive squares in 4 ways, for example, as 15565057600 + 51075096004 = 124760^2 + 225998^2 .

It is not an unprimeable number, because it can be changed into a prime (66640153603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 832424 + ... + 908960.

It is an arithmetic number, because the mean of its divisors is an integer number (4906277145).

Almost surely, 2^66640153604 is an apocalyptic number.

It is an amenable number.

66640153604 is a deficient number, since it is larger than the sum of its proper divisors (51110497876).

66640153604 is a wasteful number, since it uses less digits than its factorization.

66640153604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78647 (or 78645 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 66640153604 in words is "sixty-six billion, six hundred forty million, one hundred fifty-three thousand, six hundred four".