66404646044 has 24 divisors (see below), whose sum is σ = 126779830128. Its totient is φ = 30182186240.

The previous prime is 66404646019. The next prime is 66404646137. The reversal of 66404646044 is 44064640466.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 66404645986 and 66404646004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1016084 + ... + 1079460.

It is an arithmetic number, because the mean of its divisors is an integer number (5282492922).

Almost surely, 2^66404646044 is an apocalyptic number.

It is an amenable number.

66404646044 is a deficient number, since it is larger than the sum of its proper divisors (60375184084).

66404646044 is a wasteful number, since it uses less digits than its factorization.

66404646044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87205 (or 87203 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 44.

The spelling of 66404646044 in words is "sixty-six billion, four hundred four million, six hundred forty-six thousand, forty-four".