66981572061 has 8 divisors (see below), whose sum is σ = 89310556704. Its totient is φ = 44653484400.

The previous prime is 66981572059. The next prime is 66981572089. The reversal of 66981572061 is 16027518966.

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

It is not a de Polignac number, because 66981572061 - 2¹ = 66981572059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66981571995 and 66981572013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66981572051) 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, 24615 + ... + 366836.

It is an arithmetic number, because the mean of its divisors is an integer number (11163819588).

Almost surely, 2^66981572061 is an apocalyptic number.

It is an amenable number.

66981572061 is a deficient number, since it is larger than the sum of its proper divisors (22328984643).

66981572061 is a wasteful number, since it uses less digits than its factorization.

66981572061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448491.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 66981572061 in words is "sixty-six billion, nine hundred eighty-one million, five hundred seventy-two thousand, sixty-one".