65680018421 has 8 divisors (see below), whose sum is σ = 67519498200. Its totient is φ = 63843925248.

The previous prime is 65680018399. The next prime is 65680018433. The reversal of 65680018421 is 12481008656.

It can be written as a sum of positive squares in 4 ways, for example, as 26361094321 + 39318924100 = 162361^2 + 198290^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65680018421 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 (65680018321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 807296 + ... + 884921.

It is an arithmetic number, because the mean of its divisors is an integer number (8439937275).

Almost surely, 2^65680018421 is an apocalyptic number.

It is an amenable number.

65680018421 is a deficient number, since it is larger than the sum of its proper divisors (1839479779).

65680018421 is a wasteful number, since it uses less digits than its factorization.

65680018421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693303.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 65680018421 in words is "sixty-five billion, six hundred eighty million, eighteen thousand, four hundred twenty-one".