66937931811 has 12 divisors (see below), whose sum is σ = 96713281080. Its totient is φ = 44613676800.

The previous prime is 66937931761. The next prime is 66937931821. The reversal of 66937931811 is 11813973966.

It is a happy number.

It is not a de Polignac number, because 66937931811 - 2²¹ = 66935834659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66937931821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 931006 + ... + 1000323.

It is an arithmetic number, because the mean of its divisors is an integer number (8059440090).

Almost surely, 2^66937931811 is an apocalyptic number.

66937931811 is a deficient number, since it is larger than the sum of its proper divisors (29775349269).

66937931811 is a wasteful number, since it uses less digits than its factorization.

66937931811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935186 (or 1935183 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The spelling of 66937931811 in words is "sixty-six billion, nine hundred thirty-seven million, nine hundred thirty-one thousand, eight hundred eleven".