420044720625545 has 4 divisors (see below), whose sum is σ = 504053664750660. Its totient is φ = 336035776500432.

The previous prime is 420044720625527. The next prime is 420044720625553. The reversal of 420044720625545 is 545526027440024.

It is a happy number.

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 137212243620169 + 282832477005376 = 11713763^2 + 16817624^2 .

It is a cyclic number.

It is not a de Polignac number, because 420044720625545 - 2⁸ = 420044720625289 is a prime.

It is a super-2 number, since 2×420044720625545² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 420044720625493 and 420044720625502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42004472062550 + ... + 42004472062559.

It is an arithmetic number, because the mean of its divisors is an integer number (126013416187665).

Almost surely, 2^{420044720625545} is an apocalyptic number.

It is an amenable number.

420044720625545 is a deficient number, since it is larger than the sum of its proper divisors (84008944125115).

420044720625545 is an equidigital number, since it uses as much as digits as its factorization.

420044720625545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84008944125114.

The product of its (nonzero) digits is 10752000, while the sum is 50.

The spelling of 420044720625545 in words is "four hundred twenty trillion, forty-four billion, seven hundred twenty million, six hundred twenty-five thousand, five hundred forty-five".