66733029505981 has 8 divisors (see below), whose sum is σ = 67082485055040. Its totient is φ = 66384112826592.

The previous prime is 66733029505951. The next prime is 66733029505993. The reversal of 66733029505981 is 18950592033766.

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 66733029505981 - 2²¹ = 66733027408829 is a prime.

It is a super-2 number, since 2×66733029505981² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66733029505951) 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, 134469091 + ... + 134964448.

It is an arithmetic number, because the mean of its divisors is an integer number (8385310631880).

Almost surely, 2^{66733029505981} is an apocalyptic number.

It is an amenable number.

66733029505981 is a deficient number, since it is larger than the sum of its proper divisors (349455549059).

66733029505981 is a wasteful number, since it uses less digits than its factorization.

66733029505981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269434835.

The product of its (nonzero) digits is 73483200, while the sum is 64.

The spelling of 66733029505981 in words is "sixty-six trillion, seven hundred thirty-three billion, twenty-nine million, five hundred five thousand, nine hundred eighty-one".