61643111022 has 48 divisors (see below), whose sum is σ = 143282870640. Its totient is φ = 19839157632.

The previous prime is 61643110979. The next prime is 61643111027. The reversal of 61643111022 is 22011134616.

It is a happy number.

61643111022 is a `hidden beast` number, since 6 + 1 + 643 + 1 + 1 + 10 + 2 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61643111027) 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, 2172763 + ... + 2200950.

It is an arithmetic number, because the mean of its divisors is an integer number (2985059805).

Almost surely, 2^61643111022 is an apocalyptic number.

61643111022 is an abundant number, since it is smaller than the sum of its proper divisors (81639759618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61643111022 is a wasteful number, since it uses less digits than its factorization.

61643111022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373759 (or 4373747 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 61643111022 its reverse (22011134616), we get a palindrome (83654245638).

The spelling of 61643111022 in words is "sixty-one billion, six hundred forty-three million, one hundred eleven thousand, twenty-two".