65980252021 has 4 divisors (see below), whose sum is σ = 66013360012. Its totient is φ = 65947144032.

The previous prime is 65980251991. The next prime is 65980252031. The reversal of 65980252021 is 12025208956.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16150851396 + 49829400625 = 127086^2 + 223225^2 .

It is a cyclic number.

It is not a de Polignac number, because 65980252021 - 2¹⁷ = 65980120949 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 (65980252031) 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, 16551006 + ... + 16554991.

It is an arithmetic number, because the mean of its divisors is an integer number (16503340003).

Almost surely, 2^65980252021 is an apocalyptic number.

It is an amenable number.

65980252021 is a deficient number, since it is larger than the sum of its proper divisors (33107991).

65980252021 is a wasteful number, since it uses less digits than its factorization.

65980252021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33107990.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 65980252021 in words is "sixty-five billion, nine hundred eighty million, two hundred fifty-two thousand, twenty-one".