618650421381 has 24 divisors (see below), whose sum is σ = 913967518464. Its totient is φ = 403061998560.

The previous prime is 618650421377. The next prime is 618650421409. The reversal of 618650421381 is 183124056816.

618650421381 is a `hidden beast` number, since 6 + 1 + 8 + 6 + 504 + 2 + 138 + 1 = 666.

It is not a de Polignac number, because 618650421381 - 2² = 618650421377 is a prime.

It is a super-2 number, since 2×618650421381² (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 (618650421581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 793785 + ... + 1366526.

It is an arithmetic number, because the mean of its divisors is an integer number (38081979936).

Almost surely, 2^618650421381 is an apocalyptic number.

It is an amenable number.

618650421381 is a deficient number, since it is larger than the sum of its proper divisors (295317097083).

618650421381 is a wasteful number, since it uses less digits than its factorization.

618650421381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161041 (or 2161038 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 618650421381 in words is "six hundred eighteen billion, six hundred fifty million, four hundred twenty-one thousand, three hundred eighty-one".