611610106561 has 4 divisors (see below), whose sum is σ = 611614597552. Its totient is φ = 611605615572.

The previous prime is 611610106553. The next prime is 611610106567. The reversal of 611610106561 is 165601016116.

611610106561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 611610106561 - 2³ = 611610106553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611610106567) 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, 2034615 + ... + 2315788.

It is an arithmetic number, because the mean of its divisors is an integer number (152903649388).

Almost surely, 2^611610106561 is an apocalyptic number.

It is an amenable number.

611610106561 is a deficient number, since it is larger than the sum of its proper divisors (4490991).

611610106561 is a wasteful number, since it uses less digits than its factorization.

611610106561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4490990.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 611610106561 in words is "six hundred eleven billion, six hundred ten million, one hundred six thousand, five hundred sixty-one".