761661 has 6 divisors (see below), whose sum is σ = 1100190. Its totient is φ = 507768.

The previous prime is 761633. The next prime is 761669. The reversal of 761661 is 166167.

761661 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 4761 = 870^2 + 69^2 .

It is not a de Polignac number, because 761661 - 2⁶ = 761597 is a prime.

761661 is strictly pandigital in base 7.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 761661.

It is not an unprimeable number, because it can be changed into a prime (761669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42306 + ... + 42323.

It is an arithmetic number, because the mean of its divisors is an integer number (183365).

2⁷⁶¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

761661 is a deficient number, since it is larger than the sum of its proper divisors (338529).

761661 is a wasteful number, since it uses less digits than its factorization.

761661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84635 (or 84632 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 761661 is about 872.7319176013. The cubic root of 761661 is about 91.3244866254.

It can be divided in two parts, 76166 and 1, that added together give a palindrome (76167).

The spelling of 761661 in words is "seven hundred sixty-one thousand, six hundred sixty-one".