420942247640993 has 4 divisors (see below), whose sum is σ = 453322420536468. Its totient is φ = 388562074745520.

The previous prime is 420942247640987. The next prime is 420942247641061. The reversal of 420942247640993 is 399046742249024.

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 226020915456064 + 194921332184929 = 15033992^2 + 13961423^2 .

It is not a de Polignac number, because 420942247640993 - 2¹⁶ = 420942247575457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420942247640963) 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, 16190086447718 + ... + 16190086447743.

It is an arithmetic number, because the mean of its divisors is an integer number (113330605134117).

Almost surely, 2^{420942247640993} is an apocalyptic number.

It is an amenable number.

420942247640993 is a deficient number, since it is larger than the sum of its proper divisors (32380172895475).

420942247640993 is a wasteful number, since it uses less digits than its factorization.

420942247640993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32380172895474.

The product of its (nonzero) digits is 188116992, while the sum is 65.

The spelling of 420942247640993 in words is "four hundred twenty trillion, nine hundred forty-two billion, two hundred forty-seven million, six hundred forty thousand, nine hundred ninety-three".