661012422 has 16 divisors (see below), whose sum is σ = 1510885632. Its totient is φ = 188860680.

The previous prime is 661012403. The next prime is 661012427. The reversal of 661012422 is 224210166.

It is a junction number, because it is equal to n+sod(n) for n = 661012392 and 661012401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661012427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7869154 + ... + 7869237.

It is an arithmetic number, because the mean of its divisors is an integer number (94430352).

Almost surely, 2^661012422 is an apocalyptic number.

661012422 is an abundant number, since it is smaller than the sum of its proper divisors (849873210).

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

661012422 is a wasteful number, since it uses less digits than its factorization.

661012422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15738403.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 661012422 is about 25710.1618431312. The cubic root of 661012422 is about 871.1037306108.

Adding to 661012422 its reverse (224210166), we get a palindrome (885222588).

The spelling of 661012422 in words is "six hundred sixty-one million, twelve thousand, four hundred twenty-two".