611555055421 has 4 divisors (see below), whose sum is σ = 617859746812. Its totient is φ = 605250364032.

The previous prime is 611555055389. The next prime is 611555055427. The reversal of 611555055421 is 124550555116.

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 510010222500 + 101544832921 = 714150^2 + 318661^2 .

It is a cyclic number.

It is not a de Polignac number, because 611555055421 - 2⁵ = 611555055389 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 (611555055427) 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, 3152345550 + ... + 3152345743.

It is an arithmetic number, because the mean of its divisors is an integer number (154464936703).

Almost surely, 2^611555055421 is an apocalyptic number.

It is an amenable number.

611555055421 is a deficient number, since it is larger than the sum of its proper divisors (6304691391).

611555055421 is an equidigital number, since it uses as much as digits as its factorization.

611555055421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6304691390.

The product of its (nonzero) digits is 150000, while the sum is 40.

The spelling of 611555055421 in words is "six hundred eleven billion, five hundred fifty-five million, fifty-five thousand, four hundred twenty-one".