63553371421 has 4 divisors (see below), whose sum is σ = 67291805052. Its totient is φ = 59814937792.

The previous prime is 63553371379. The next prime is 63553371439. The reversal of 63553371421 is 12417335536.

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 25142859225 + 38410512196 = 158565^2 + 195986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63553371421 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 (63553371451) 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, 1869216790 + ... + 1869216823.

It is an arithmetic number, because the mean of its divisors is an integer number (16822951263).

Almost surely, 2^63553371421 is an apocalyptic number.

It is an amenable number.

63553371421 is a deficient number, since it is larger than the sum of its proper divisors (3738433631).

63553371421 is a wasteful number, since it uses less digits than its factorization.

63553371421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3738433630.

The product of its digits is 226800, while the sum is 40.

The spelling of 63553371421 in words is "sixty-three billion, five hundred fifty-three million, three hundred seventy-one thousand, four hundred twenty-one".