66938680061 has 8 divisors (see below), whose sum is σ = 73028732448. Its totient is φ = 60849414000.

The previous prime is 66938680057. The next prime is 66938680097. The reversal of 66938680061 is 16008683966.

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

It is a cyclic number.

It is not a de Polignac number, because 66938680061 - 2² = 66938680057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66938679985 and 66938680012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66938680561) 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, 10955 + ... + 366056.

It is an arithmetic number, because the mean of its divisors is an integer number (9128591556).

Almost surely, 2^66938680061 is an apocalyptic number.

It is an amenable number.

66938680061 is a deficient number, since it is larger than the sum of its proper divisors (6090052387).

66938680061 is a wasteful number, since it uses less digits than its factorization.

66938680061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393163.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 66938680061 in words is "sixty-six billion, nine hundred thirty-eight million, six hundred eighty thousand, sixty-one".