661774092 has 48 divisors (see below), whose sum is σ = 1766150400. Its totient is φ = 188926272.

The previous prime is 661774067. The next prime is 661774093. The reversal of 661774092 is 290477166.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140398 + ... + 145034.

It is an arithmetic number, because the mean of its divisors is an integer number (36794800).

Almost surely, 2^661774092 is an apocalyptic number.

It is an amenable number.

661774092 is an abundant number, since it is smaller than the sum of its proper divisors (1104376308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661774092 is a wasteful number, since it uses less digits than its factorization.

661774092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6350 (or 6348 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 661774092 is about 25724.9702040644. The cubic root of 661774092 is about 871.4381867049.

The spelling of 661774092 in words is "six hundred sixty-one million, seven hundred seventy-four thousand, ninety-two".