611221220105 has 4 divisors (see below), whose sum is σ = 733465464132. Its totient is φ = 488976976080.

The previous prime is 611221220101. The next prime is 611221220131. The reversal of 611221220105 is 501022122116.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 411007927801 + 200213292304 = 641099^2 + 447452^2 .

It is not a de Polignac number, because 611221220105 - 2² = 611221220101 is a prime.

It is a super-2 number, since 2×611221220105² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611221220101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61122122006 + ... + 61122122015.

It is an arithmetic number, because the mean of its divisors is an integer number (183366366033).

Almost surely, 2^611221220105 is an apocalyptic number.

It is an amenable number.

611221220105 is a deficient number, since it is larger than the sum of its proper divisors (122244244027).

611221220105 is a wasteful number, since it uses less digits than its factorization.

611221220105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122244244026.

The product of its (nonzero) digits is 480, while the sum is 23.

The spelling of 611221220105 in words is "six hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, one hundred five".