421171744657 has 8 divisors (see below), whose sum is σ = 431454965760. Its totient is φ = 410889035040.

The previous prime is 421171744639. The next prime is 421171744711. The reversal of 421171744657 is 756447171124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421171744657 - 2⁷ = 421171744529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421171744657.

It is not an unprimeable number, because it can be changed into a prime (421171714657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1943788 + ... + 2149570.

It is an arithmetic number, because the mean of its divisors is an integer number (53931870720).

Almost surely, 2^421171744657 is an apocalyptic number.

It is an amenable number.

421171744657 is a deficient number, since it is larger than the sum of its proper divisors (10283221103).

421171744657 is a wasteful number, since it uses less digits than its factorization.

421171744657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255743.

The product of its digits is 1317120, while the sum is 49.

The spelling of 421171744657 in words is "four hundred twenty-one billion, one hundred seventy-one million, seven hundred forty-four thousand, six hundred fifty-seven".