437645475421 has 16 divisors (see below), whose sum is σ = 548983392768. Its totient is φ = 338930276400.

The previous prime is 437645475389. The next prime is 437645475437. The reversal of 437645475421 is 124574546734.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 437645475421 - 2⁵ = 437645475389 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 (437645475461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17422135 + ... + 17447236.

It is an arithmetic number, because the mean of its divisors is an integer number (34311462048).

Almost surely, 2^437645475421 is an apocalyptic number.

It is an amenable number.

437645475421 is a deficient number, since it is larger than the sum of its proper divisors (111337917347).

437645475421 is a wasteful number, since it uses less digits than its factorization.

437645475421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34869552.

The product of its digits is 11289600, while the sum is 52.

The spelling of 437645475421 in words is "four hundred thirty-seven billion, six hundred forty-five million, four hundred seventy-five thousand, four hundred twenty-one".