66541466564140 has 24 divisors (see below), whose sum is σ = 139737235799952. Its totient is φ = 26616556908480.

The previous prime is 66541466564119. The next prime is 66541466564147. The reversal of 66541466564140 is 4146566414566.

It is not an unprimeable number, because it can be changed into a prime (66541466564147) 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, 29040502 + ... + 31247938.

It is an arithmetic number, because the mean of its divisors is an integer number (5822384824998).

Almost surely, 2^{66541466564140} is an apocalyptic number.

It is an amenable number.

66541466564140 is an abundant number, since it is smaller than the sum of its proper divisors (73195769235812).

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

66541466564140 is a wasteful number, since it uses less digits than its factorization.

66541466564140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714657 (or 3714655 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 58.

The spelling of 66541466564140 in words is "sixty-six trillion, five hundred forty-one billion, four hundred sixty-six million, five hundred sixty-four thousand, one hundred forty".