65800021172 has 12 divisors (see below), whose sum is σ = 115153043460. Its totient is φ = 32899151616.

The previous prime is 65800021123. The next prime is 65800021207. The reversal of 65800021172 is 27112000856.

It can be written as a sum of positive squares in 2 ways, for example, as 46519587856 + 19280433316 = 215684^2 + 138854^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23453 + ... + 363524.

It is an arithmetic number, because the mean of its divisors is an integer number (9596086955).

Almost surely, 2^65800021172 is an apocalyptic number.

It is an amenable number.

65800021172 is a deficient number, since it is larger than the sum of its proper divisors (49353022288).

65800021172 is a wasteful number, since it uses less digits than its factorization.

65800021172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429490 (or 429488 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The spelling of 65800021172 in words is "sixty-five billion, eight hundred million, twenty-one thousand, one hundred seventy-two".