421416566261 has 4 divisors (see below), whose sum is σ = 421450348800. Its totient is φ = 421382783724.

The previous prime is 421416566227. The next prime is 421416566281. The reversal of 421416566261 is 162665614124.

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 a de Polignac number, because none of the positive numbers 2^k-421416566261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421416566201) 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, 16872551 + ... + 16897508.

It is an arithmetic number, because the mean of its divisors is an integer number (105362587200).

Almost surely, 2^421416566261 is an apocalyptic number.

It is an amenable number.

421416566261 is a deficient number, since it is larger than the sum of its proper divisors (33782539).

421416566261 is a wasteful number, since it uses less digits than its factorization.

421416566261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33782538.

The product of its digits is 414720, while the sum is 44.

The spelling of 421416566261 in words is "four hundred twenty-one billion, four hundred sixteen million, five hundred sixty-six thousand, two hundred sixty-one".