636141771621 has 24 divisors (see below), whose sum is σ = 972989993664. Its totient is φ = 399120174720.

The previous prime is 636141771607. The next prime is 636141771761. The reversal of 636141771621 is 126177141636.

It is a happy number.

636141771621 is a `hidden beast` number, since 6 + 3 + 6 + 1 + 4 + 17 + 7 + 1 + 621 = 666.

It is not a de Polignac number, because 636141771621 - 2⁶ = 636141771557 is a prime.

It is a super-2 number, since 2×636141771621² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636141778621) 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, 2200330 + ... + 2472596.

It is an arithmetic number, because the mean of its divisors is an integer number (40541249736).

Almost surely, 2^636141771621 is an apocalyptic number.

It is an amenable number.

636141771621 is a deficient number, since it is larger than the sum of its proper divisors (336848222043).

636141771621 is a wasteful number, since it uses less digits than its factorization.

636141771621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287561 (or 287558 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 636141771621 in words is "six hundred thirty-six billion, one hundred forty-one million, seven hundred seventy-one thousand, six hundred twenty-one".