66931638043 has 8 divisors (see below), whose sum is σ = 70916478912. Its totient is φ = 62952095616.

The previous prime is 66931638001. The next prime is 66931638071. The reversal of 66931638043 is 34083613966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66931638043 - 2¹³ = 66931629851 is a prime.

It is a super-2 number, since 2×66931638043² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66931638743) 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, 1298580 + ... + 1349137.

It is an arithmetic number, because the mean of its divisors is an integer number (8864559864).

Almost surely, 2^66931638043 is an apocalyptic number.

66931638043 is a deficient number, since it is larger than the sum of its proper divisors (3984840869).

66931638043 is a wasteful number, since it uses less digits than its factorization.

66931638043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2649221.

The product of its (nonzero) digits is 1679616, while the sum is 49.

The spelling of 66931638043 in words is "sixty-six billion, nine hundred thirty-one million, six hundred thirty-eight thousand, forty-three".