66541517442 has 64 divisors (see below), whose sum is σ = 154341365760. Its totient is φ = 21210334992.

The previous prime is 66541517423. The next prime is 66541517473. The reversal of 66541517442 is 24471514566.

66541517442 is a `hidden beast` number, since 6 + 6 + 54 + 151 + 7 + 442 = 666.

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, 8743603 + ... + 8751209.

It is an arithmetic number, because the mean of its divisors is an integer number (2411583840).

Almost surely, 2^66541517442 is an apocalyptic number.

66541517442 is an abundant number, since it is smaller than the sum of its proper divisors (87799848318).

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

66541517442 is a wasteful number, since it uses less digits than its factorization.

66541517442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14684 (or 14678 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 66541517442 in words is "sixty-six billion, five hundred forty-one million, five hundred seventeen thousand, four hundred forty-two".