610611661 has 16 divisors (see below), whose sum is σ = 713821248. Its totient is φ = 516140800.

The previous prime is 610611637. The next prime is 610611671. The reversal of 610611661 is 166116016.

It is a cyclic number.

It is not a de Polignac number, because 610611661 - 2¹¹ = 610609613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610611601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4150 + ... + 35191.

It is an arithmetic number, because the mean of its divisors is an integer number (44613828).

Almost surely, 2^610611661 is an apocalyptic number.

It is an amenable number.

610611661 is a deficient number, since it is larger than the sum of its proper divisors (103209587).

610611661 is a wasteful number, since it uses less digits than its factorization.

610611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39452.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 610611661 is about 24710.5576829015. The cubic root of 610611661 is about 848.3759814629.

Adding to 610611661 its reverse (166116016), we get a palindrome (776727677).

The spelling of 610611661 in words is "six hundred ten million, six hundred eleven thousand, six hundred sixty-one".