66973061994 has 32 divisors (see below), whose sum is σ = 142444681920. Its totient is φ = 20919397632.

The previous prime is 66973061993. The next prime is 66973062001. The reversal of 66973061994 is 49916037966.

It is not an unprimeable number, because it can be changed into a prime (66973061993) 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, 1410264 + ... + 1456979.

It is an arithmetic number, because the mean of its divisors is an integer number (4451396310).

Almost surely, 2^66973061994 is an apocalyptic number.

66973061994 is an abundant number, since it is smaller than the sum of its proper divisors (75471619926).

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

66973061994 is a wasteful number, since it uses less digits than its factorization.

66973061994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867494.

The product of its (nonzero) digits is 13226976, while the sum is 60.

The spelling of 66973061994 in words is "sixty-six billion, nine hundred seventy-three million, sixty-one thousand, nine hundred ninety-four".