66811373037 has 6 divisors (see below), whose sum is σ = 96505316622. Its totient is φ = 44540915352.

The previous prime is 66811373033. The next prime is 66811373047. The reversal of 66811373037 is 73037311866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 41765461956 + 25045911081 = 204366^2 + 158259^2 .

It is not a de Polignac number, because 66811373037 - 2² = 66811373033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66811372983 and 66811373001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66811373033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3711742938 + ... + 3711742955.

It is an arithmetic number, because the mean of its divisors is an integer number (16084219437).

Almost surely, 2^66811373037 is an apocalyptic number.

It is an amenable number.

66811373037 is a deficient number, since it is larger than the sum of its proper divisors (29693943585).

66811373037 is a wasteful number, since it uses less digits than its factorization.

66811373037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7423485899 (or 7423485896 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The spelling of 66811373037 in words is "sixty-six billion, eight hundred eleven million, three hundred seventy-three thousand, thirty-seven".