661774095 has 12 divisors (see below), whose sum is σ = 1147075176. Its totient is φ = 352946160.

The previous prime is 661774093. The next prime is 661774103. The reversal of 661774095 is 590477166.

It is a happy number.

It is not a de Polignac number, because 661774095 - 2¹ = 661774093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 14706091 = 661774095 / (6 + 6 + 1 + 7 + 7 + 4 + 0 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 661774095.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661774093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7353001 + ... + 7353090.

It is an arithmetic number, because the mean of its divisors is an integer number (95589598).

Almost surely, 2^661774095 is an apocalyptic number.

661774095 is a deficient number, since it is larger than the sum of its proper divisors (485301081).

661774095 is a wasteful number, since it uses less digits than its factorization.

661774095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14706102 (or 14706099 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 661774095 is about 25724.9702623735. The cubic root of 661774095 is about 871.4381880217.

The spelling of 661774095 in words is "six hundred sixty-one million, seven hundred seventy-four thousand, ninety-five".