65671637677 has 4 divisors (see below), whose sum is σ = 69128039680. Its totient is φ = 62215235676.

The previous prime is 65671637663. The next prime is 65671637683. The reversal of 65671637677 is 77673617656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65671637677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65671635677) 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, 1728200973 + ... + 1728201010.

It is an arithmetic number, because the mean of its divisors is an integer number (17282009920).

Almost surely, 2^65671637677 is an apocalyptic number.

It is an amenable number.

65671637677 is a deficient number, since it is larger than the sum of its proper divisors (3456402003).

65671637677 is a wasteful number, since it uses less digits than its factorization.

65671637677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3456402002.

The product of its digits is 46675440, while the sum is 61.

The spelling of 65671637677 in words is "sixty-five billion, six hundred seventy-one million, six hundred thirty-seven thousand, six hundred seventy-seven".