661422340 has 24 divisors (see below), whose sum is σ = 1408017240. Its totient is φ = 260944128.

The previous prime is 661422301. The next prime is 661422341. The reversal of 661422340 is 43224166.

It can be written as a sum of positive squares in 4 ways, for example, as 296459524 + 364962816 = 17218^2 + 19104^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661422299 and 661422308.

It is not an unprimeable number, because it can be changed into a prime (661422341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225055 + ... + 227974.

It is an arithmetic number, because the mean of its divisors is an integer number (58667385).

Almost surely, 2^661422340 is an apocalyptic number.

It is an amenable number.

661422340 is an abundant number, since it is smaller than the sum of its proper divisors (746594900).

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

661422340 is a wasteful number, since it uses less digits than its factorization.

661422340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453111 (or 453109 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 661422340 is about 25718.1325138510. The cubic root of 661422340 is about 871.2837611718.

The spelling of 661422340 in words is "six hundred sixty-one million, four hundred twenty-two thousand, three hundred forty".