65312273818 has 32 divisors (see below), whose sum is σ = 107826340608. Its totient is φ = 29668541760.

The previous prime is 65312273779. The next prime is 65312273821. The reversal of 65312273818 is 81837221356.

It is a super-2 number, since 2×65312273818² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4723471 + ... + 4737277.

It is an arithmetic number, because the mean of its divisors is an integer number (3369573144).

Almost surely, 2^65312273818 is an apocalyptic number.

65312273818 is a deficient number, since it is larger than the sum of its proper divisors (42514066790).

65312273818 is a wasteful number, since it uses less digits than its factorization.

65312273818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15619 (or 15597 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The spelling of 65312273818 in words is "sixty-five billion, three hundred twelve million, two hundred seventy-three thousand, eight hundred eighteen".