66840197038 has 16 divisors (see below), whose sum is σ = 100838234880. Its totient is φ = 33227518456.

The previous prime is 66840197003. The next prime is 66840197051. The reversal of 66840197038 is 83079104866.

It is a happy number.

It is a super-2 number, since 2×66840197038² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2581545 + ... + 2607307.

It is an arithmetic number, because the mean of its divisors is an integer number (6302389680).

Almost surely, 2^66840197038 is an apocalyptic number.

66840197038 is a deficient number, since it is larger than the sum of its proper divisors (33998037842).

66840197038 is a wasteful number, since it uses less digits than its factorization.

66840197038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33191.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 66840197038 in words is "sixty-six billion, eight hundred forty million, one hundred ninety-seven thousand, thirty-eight".