66836482421 has 4 divisors (see below), whose sum is σ = 67010990592. Its totient is φ = 66661974252.

The previous prime is 66836482393. The next prime is 66836482423. The reversal of 66836482421 is 12428463866.

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 not a de Polignac number, because 66836482421 - 2³⁰ = 65762740597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66836482421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66836482423) 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, 87253511 + ... + 87254276.

It is an arithmetic number, because the mean of its divisors is an integer number (16752747648).

Almost surely, 2^66836482421 is an apocalyptic number.

It is an amenable number.

66836482421 is a deficient number, since it is larger than the sum of its proper divisors (174508171).

66836482421 is a wasteful number, since it uses less digits than its factorization.

66836482421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174508170.

The product of its digits is 2654208, while the sum is 50.

The spelling of 66836482421 in words is "sixty-six billion, eight hundred thirty-six million, four hundred eighty-two thousand, four hundred twenty-one".