66661055651500 has 96 divisors (see below), whose sum is σ = 146182435753536. Its totient is φ = 26555544780800.

The previous prime is 66661055651483. The next prime is 66661055651539. The reversal of 66661055651500 is 515655016666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 704518194 + ... + 704612806.

It is an arithmetic number, because the mean of its divisors is an integer number (1522733705766).

Almost surely, 2^{66661055651500} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66661055651500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73091217876768).

66661055651500 is an abundant number, since it is smaller than the sum of its proper divisors (79521380102036).

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

66661055651500 is a wasteful number, since it uses less digits than its factorization.

66661055651500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100372 (or 100360 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 66661055651500 in words is "sixty-six trillion, six hundred sixty-one billion, fifty-five million, six hundred fifty-one thousand, five hundred".