611115620854621 has 4 divisors (see below), whose sum is σ = 611125399236412. Its totient is φ = 611105842472832.

The previous prime is 611115620854619. The next prime is 611115620854667. The reversal of 611115620854621 is 126458026511116.

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 446490169738596 + 164625451116025 = 21130314^2 + 12830645^2 .

It is a cyclic number.

It is not a de Polignac number, because 611115620854621 - 2¹ = 611115620854619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611815620854621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4889097150 + ... + 4889222143.

It is an arithmetic number, because the mean of its divisors is an integer number (152781349809103).

Almost surely, 2^{611115620854621} is an apocalyptic number.

It is an amenable number.

611115620854621 is a deficient number, since it is larger than the sum of its proper divisors (9778381791).

611115620854621 is an equidigital number, since it uses as much as digits as its factorization.

611115620854621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9778381790.

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 611115620854621 in words is "six hundred eleven trillion, one hundred fifteen billion, six hundred twenty million, eight hundred fifty-four thousand, six hundred twenty-one".