420065721631 has 8 divisors (see below), whose sum is σ = 424704404384. Its totient is φ = 415437815520.

The previous prime is 420065721611. The next prime is 420065721637. The reversal of 420065721631 is 136127560024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420065721631 - 2¹⁷ = 420065590559 is a prime.

It is a super-2 number, since 2×420065721631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420065721637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2615760 + ... + 2771701.

It is an arithmetic number, because the mean of its divisors is an integer number (53088050548).

Almost surely, 2^420065721631 is an apocalyptic number.

420065721631 is a deficient number, since it is larger than the sum of its proper divisors (4638682753).

420065721631 is a wasteful number, since it uses less digits than its factorization.

420065721631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5388321.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 420065721631 in words is "four hundred twenty billion, sixty-five million, seven hundred twenty-one thousand, six hundred thirty-one".