66774031103 has 4 divisors (see below), whose sum is σ = 71910495048. Its totient is φ = 61637567160.

The previous prime is 66774031099. The next prime is 66774031109. The reversal of 66774031103 is 30113047766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30113047766 = 2 ⋅15056523883.

It is not a de Polignac number, because 66774031103 - 2² = 66774031099 is a prime.

It is a super-2 number, since 2×66774031103² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66774031109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2568231953 + ... + 2568231978.

It is an arithmetic number, because the mean of its divisors is an integer number (17977623762).

Almost surely, 2^66774031103 is an apocalyptic number.

66774031103 is a deficient number, since it is larger than the sum of its proper divisors (5136463945).

66774031103 is a wasteful number, since it uses less digits than its factorization.

66774031103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136463944.

The product of its (nonzero) digits is 63504, while the sum is 38.

Adding to 66774031103 its reverse (30113047766), we get a palindrome (96887078869).

The spelling of 66774031103 in words is "sixty-six billion, seven hundred seventy-four million, thirty-one thousand, one hundred three".