661281422 has 4 divisors (see below), whose sum is σ = 991922136. Its totient is φ = 330640710.

The previous prime is 661281421. The next prime is 661281431. The reversal of 661281422 is 224182166.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661281421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165320354 + ... + 165320357.

It is an arithmetic number, because the mean of its divisors is an integer number (247980534).

Almost surely, 2^661281422 is an apocalyptic number.

661281422 is a deficient number, since it is larger than the sum of its proper divisors (330640714).

661281422 is a wasteful number, since it uses less digits than its factorization.

661281422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330640713.

The product of its digits is 9216, while the sum is 32.

The square root of 661281422 is about 25715.3927055373. The cubic root of 661281422 is about 871.2218802433.

The spelling of 661281422 in words is "six hundred sixty-one million, two hundred eighty-one thousand, four hundred twenty-two".