66343501994 has 32 divisors (see below), whose sum is σ = 124125734016. Its totient is φ = 25836707520.

The previous prime is 66343501969. The next prime is 66343501999. The reversal of 66343501994 is 49910534366.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66343501999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259184 + ... + 447060.

It is an arithmetic number, because the mean of its divisors is an integer number (3878929188).

Almost surely, 2^66343501994 is an apocalyptic number.

66343501994 is a deficient number, since it is larger than the sum of its proper divisors (57782232022).

66343501994 is a wasteful number, since it uses less digits than its factorization.

66343501994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190190.

The product of its (nonzero) digits is 2099520, while the sum is 50.

The spelling of 66343501994 in words is "sixty-six billion, three hundred forty-three million, five hundred one thousand, nine hundred ninety-four".