66456518072 has 32 divisors (see below), whose sum is σ = 142861836000. Its totient is φ = 28390362624.

The previous prime is 66456517993. The next prime is 66456518077. The reversal of 66456518072 is 27081565466.

It is a self number, because there is not a number n which added to its sum of digits gives 66456518072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66456518077) 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, 1878197 + ... + 1913252.

It is an arithmetic number, because the mean of its divisors is an integer number (4464432375).

Almost surely, 2^66456518072 is an apocalyptic number.

It is an amenable number.

66456518072 is an abundant number, since it is smaller than the sum of its proper divisors (76405317928).

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

66456518072 is a wasteful number, since it uses less digits than its factorization.

66456518072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791775 (or 3791771 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 66456518072 in words is "sixty-six billion, four hundred fifty-six million, five hundred eighteen thousand, seventy-two".