689801253621 has 8 divisors (see below), whose sum is σ = 919760980320. Its totient is φ = 459854514672.

The previous prime is 689801253613. The next prime is 689801253637. The reversal of 689801253621 is 126352108986.

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

It is not a de Polignac number, because 689801253621 - 2³ = 689801253613 is a prime.

It is a super-2 number, since 2×689801253621² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689801253821) 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, 3122326 + ... + 3335943.

It is an arithmetic number, because the mean of its divisors is an integer number (114970122540).

Almost surely, 2^689801253621 is an apocalyptic number.

It is an amenable number.

689801253621 is a deficient number, since it is larger than the sum of its proper divisors (229959726699).

689801253621 is a wasteful number, since it uses less digits than its factorization.

689801253621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6493875.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 689801253621 in words is "six hundred eighty-nine billion, eight hundred one million, two hundred fifty-three thousand, six hundred twenty-one".