421753172553 has 6 divisors (see below), whose sum is σ = 609199027034. Its totient is φ = 281168781696.

The previous prime is 421753172509. The next prime is 421753172569. The reversal of 421753172553 is 355271357124.

421753172553 is a `hidden beast` number, since 4 + 21 + 7 + 5 + 3 + 1 + 72 + 553 = 666.

It can be written as a sum of positive squares in only one way, i.e., 266243616144 + 155509556409 = 515988^2 + 394347^2 .

It is not a de Polignac number, because 421753172553 - 2¹⁸ = 421752910409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421753172499 and 421753172508.

It is not an unprimeable number, because it can be changed into a prime (421753177553) 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 5 ways as a sum of consecutive naturals, for example, 23430731800 + ... + 23430731817.

Almost surely, 2^421753172553 is an apocalyptic number.

It is an amenable number.

421753172553 is a deficient number, since it is larger than the sum of its proper divisors (187445854481).

421753172553 is a wasteful number, since it uses less digits than its factorization.

421753172553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46861463623 (or 46861463620 counting only the distinct ones).

The product of its digits is 882000, while the sum is 45.

The spelling of 421753172553 in words is "four hundred twenty-one billion, seven hundred fifty-three million, one hundred seventy-two thousand, five hundred fifty-three".