66034531381 has 16 divisors (see below), whose sum is σ = 81282587008. Its totient is φ = 52241112000.

The previous prime is 66034531379. The next prime is 66034531397. The reversal of 66034531381 is 18313543066.

It is not a de Polignac number, because 66034531381 - 2¹ = 66034531379 is a prime.

It is a super-2 number, since 2×66034531381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66034531181) 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, 864346 + ... + 937636.

It is an arithmetic number, because the mean of its divisors is an integer number (5080161688).

Almost surely, 2^66034531381 is an apocalyptic number.

It is an amenable number.

66034531381 is a deficient number, since it is larger than the sum of its proper divisors (15248055627).

66034531381 is a wasteful number, since it uses less digits than its factorization.

66034531381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83212.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 66034531381 in words is "sixty-six billion, thirty-four million, five hundred thirty-one thousand, three hundred eighty-one".