420440544581 has 4 divisors (see below), whose sum is σ = 426362242464. Its totient is φ = 414518846700.

The previous prime is 420440544533. The next prime is 420440544599. The reversal of 420440544581 is 185445044024.

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 420440544581 - 2¹⁰ = 420440543557 is a prime.

It is a super-2 number, since 2×420440544581² (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 (420440544781) 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, 2960848835 + ... + 2960848976.

It is an arithmetic number, because the mean of its divisors is an integer number (106590560616).

Almost surely, 2^420440544581 is an apocalyptic number.

It is an amenable number.

420440544581 is a deficient number, since it is larger than the sum of its proper divisors (5921697883).

420440544581 is an equidigital number, since it uses as much as digits as its factorization.

420440544581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5921697882.

The product of its (nonzero) digits is 409600, while the sum is 41.

The spelling of 420440544581 in words is "four hundred twenty billion, four hundred forty million, five hundred forty-four thousand, five hundred eighty-one".