66630421351 has 4 divisors (see below), whose sum is σ = 71755838392. Its totient is φ = 61505004312.

The previous prime is 66630421337. The next prime is 66630421357. The reversal of 66630421351 is 15312403666.

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

It is a cyclic number.

It is not a de Polignac number, because 66630421351 - 2⁹ = 66630420839 is a prime.

It is a super-2 number, since 2×66630421351² (a number of 22 digits) contains 22 as substring.

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 66630421351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66630421357) 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, 2562708501 + ... + 2562708526.

It is an arithmetic number, because the mean of its divisors is an integer number (17938959598).

Almost surely, 2^66630421351 is an apocalyptic number.

66630421351 is a deficient number, since it is larger than the sum of its proper divisors (5125417041).

66630421351 is a wasteful number, since it uses less digits than its factorization.

66630421351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125417040.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 66630421351 in words is "sixty-six billion, six hundred thirty million, four hundred twenty-one thousand, three hundred fifty-one".