421665247511 has 4 divisors (see below), whose sum is σ = 421695898872. Its totient is φ = 421634596152.

The previous prime is 421665247453. The next prime is 421665247543. The reversal of 421665247511 is 115742566124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421665247511 - 2²² = 421661053207 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 (421665247561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15305036 + ... + 15332561.

It is an arithmetic number, because the mean of its divisors is an integer number (105423974718).

Almost surely, 2^421665247511 is an apocalyptic number.

421665247511 is a deficient number, since it is larger than the sum of its proper divisors (30651361).

421665247511 is a wasteful number, since it uses less digits than its factorization.

421665247511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30651360.

The product of its digits is 403200, while the sum is 44.

The spelling of 421665247511 in words is "four hundred twenty-one billion, six hundred sixty-five million, two hundred forty-seven thousand, five hundred eleven".