661110741 has 20 divisors (see below), whose sum is σ = 1003782604. Its totient is φ = 433512000.

The previous prime is 661110713. The next prime is 661110763. The reversal of 661110741 is 147011166.

661110741 is a `hidden beast` number, since 6 + 611 + 1 + 0 + 7 + 41 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 347076900 + 314033841 = 18630^2 + 17721^2 .

It is not a de Polignac number, because 661110741 - 2⁷ = 661110613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661110701) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 61960 + ... + 71841.

Almost surely, 2^661110741 is an apocalyptic number.

661110741 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

661110741 is a deficient number, since it is larger than the sum of its proper divisors (342671863).

661110741 is a wasteful number, since it uses less digits than its factorization.

661110741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133874 (or 133865 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 661110741 is about 25712.0738370128. The cubic root of 661110741 is about 871.1469177980.

The spelling of 661110741 in words is "six hundred sixty-one million, one hundred ten thousand, seven hundred forty-one".