66661038450 has 48 divisors (see below), whose sum is σ = 183688198560. Its totient is φ = 17776276560.

The previous prime is 66661038443. The next prime is 66661038461. The reversal of 66661038450 is 5483016666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 66661038396 and 66661038405.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24687924 + ... + 24690623.

It is an arithmetic number, because the mean of its divisors is an integer number (3826837470).

Almost surely, 2^66661038450 is an apocalyptic number.

66661038450 is an abundant number, since it is smaller than the sum of its proper divisors (117027160110).

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

66661038450 is a wasteful number, since it uses less digits than its factorization.

66661038450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49378568 (or 49378557 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 66661038450 in words is "sixty-six billion, six hundred sixty-one million, thirty-eight thousand, four hundred fifty".