66418350774 has 24 divisors (see below), whose sum is σ = 133435652472. Its totient is φ = 22040071200.

The previous prime is 66418350773. The next prime is 66418350829. The reversal of 66418350774 is 47705381466.

It is a happy number.

It is a super-2 number, since 2×66418350774² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66418350773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187074 + ... + 409674.

It is an arithmetic number, because the mean of its divisors is an integer number (5559818853).

Almost surely, 2^66418350774 is an apocalyptic number.

66418350774 is an abundant number, since it is smaller than the sum of its proper divisors (67017301698).

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

66418350774 is a wasteful number, since it uses less digits than its factorization.

66418350774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223052 (or 222829 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 66418350774 in words is "sixty-six billion, four hundred eighteen million, three hundred fifty thousand, seven hundred seventy-four".