66206754381 has 16 divisors (see below), whose sum is σ = 88596057600. Its totient is φ = 43977933888.

The previous prime is 66206754359. The next prime is 66206754391. The reversal of 66206754381 is 18345760266.

It is not a de Polignac number, because 66206754381 - 2⁵ = 66206754349 is a prime.

It is a super-2 number, since 2×66206754381² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66206754381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206754391) 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, 891175 + ... + 962603.

It is an arithmetic number, because the mean of its divisors is an integer number (5537253600).

Almost surely, 2^66206754381 is an apocalyptic number.

It is an amenable number.

66206754381 is a deficient number, since it is larger than the sum of its proper divisors (22389303219).

66206754381 is a wasteful number, since it uses less digits than its factorization.

66206754381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72548.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 66206754381 in words is "sixty-six billion, two hundred six million, seven hundred fifty-four thousand, three hundred eighty-one".