801663421 has 4 divisors (see below), whose sum is σ = 863329852. Its totient is φ = 739996992.

The previous prime is 801663397. The next prime is 801663427. The reversal of 801663421 is 124366108.

It is a happy number.

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 240684196 + 560979225 = 15514^2 + 23685^2 .

It is a cyclic number.

It is not a de Polignac number, because 801663421 - 2⁹ = 801662909 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 (801663427) 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, 30833196 + ... + 30833221.

It is an arithmetic number, because the mean of its divisors is an integer number (215832463).

Almost surely, 2^801663421 is an apocalyptic number.

It is an amenable number.

801663421 is a deficient number, since it is larger than the sum of its proper divisors (61666431).

801663421 is a wasteful number, since it uses less digits than its factorization.

801663421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61666430.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 801663421 is about 28313.6613845684. The cubic root of 801663421 is about 928.9607309897.

The spelling of 801663421 in words is "eight hundred one million, six hundred sixty-three thousand, four hundred twenty-one".