611561211312 has 40 divisors (see below), whose sum is σ = 1579929641920. Its totient is φ = 203845584960.

The previous prime is 611561211311. The next prime is 611561211323. The reversal of 611561211312 is 213112165116.

It is a super-2 number, since 2×611561211312² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 611561211312.

It is not an unprimeable number, because it can be changed into a prime (611561211311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1024239 + ... + 1507377.

It is an arithmetic number, because the mean of its divisors is an integer number (39498241048).

Almost surely, 2^611561211312 is an apocalyptic number.

It is an amenable number.

611561211312 is an abundant number, since it is smaller than the sum of its proper divisors (968368430608).

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

611561211312 is a wasteful number, since it uses less digits than its factorization.

611561211312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509521 (or 509515 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

Adding to 611561211312 its reverse (213112165116), we get a palindrome (824673376428).

The spelling of 611561211312 in words is "six hundred eleven billion, five hundred sixty-one million, two hundred eleven thousand, three hundred twelve".