63166456421 has 4 divisors (see below), whose sum is σ = 63483876000. Its totient is φ = 62849036844.

The previous prime is 63166456417. The next prime is 63166456429. The reversal of 63166456421 is 12465466136.

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 63166456421 - 2² = 63166456417 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 (63166456429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158709491 + ... + 158709888.

It is an arithmetic number, because the mean of its divisors is an integer number (15870969000).

Almost surely, 2^63166456421 is an apocalyptic number.

It is an amenable number.

63166456421 is a deficient number, since it is larger than the sum of its proper divisors (317419579).

63166456421 is a wasteful number, since it uses less digits than its factorization.

63166456421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317419578.

The product of its digits is 622080, while the sum is 44.

The spelling of 63166456421 in words is "sixty-three billion, one hundred sixty-six million, four hundred fifty-six thousand, four hundred twenty-one".