421335278665 has 16 divisors (see below), whose sum is σ = 578966492160. Its totient is φ = 288347993280.

The previous prime is 421335278537. The next prime is 421335278681. The reversal of 421335278665 is 566872533124.

It is not a de Polignac number, because 421335278665 - 2⁷ = 421335278537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11807481 + ... + 11843110.

It is an arithmetic number, because the mean of its divisors is an integer number (36185405760).

Almost surely, 2^421335278665 is an apocalyptic number.

It is an amenable number.

421335278665 is a deficient number, since it is larger than the sum of its proper divisors (157631213495).

421335278665 is a wasteful number, since it uses less digits than its factorization.

421335278665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23651112.

The product of its digits is 7257600, while the sum is 52.

The spelling of 421335278665 in words is "four hundred twenty-one billion, three hundred thirty-five million, two hundred seventy-eight thousand, six hundred sixty-five".