66987031105 has 16 divisors (see below), whose sum is σ = 81146761344. Its totient is φ = 53082005760.

The previous prime is 66987031087. The next prime is 66987031109. The reversal of 66987031105 is 50113078966.

It is a happy number.

It is not a de Polignac number, because 66987031105 - 2²⁵ = 66953476673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66987031109) 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, 882820 + ... + 955690.

It is an arithmetic number, because the mean of its divisors is an integer number (5071672584).

Almost surely, 2^66987031105 is an apocalyptic number.

It is an amenable number.

66987031105 is a deficient number, since it is larger than the sum of its proper divisors (14159730239).

66987031105 is a wasteful number, since it uses less digits than its factorization.

66987031105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74616.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 66987031105 in words is "sixty-six billion, nine hundred eighty-seven million, thirty-one thousand, one hundred five".