661012424 has 8 divisors (see below), whose sum is σ = 1239398310. Its totient is φ = 330506208.

The previous prime is 661012403. The next prime is 661012427. The reversal of 661012424 is 424210166.

It can be written as a sum of positive squares in only one way, i.e., 659976100 + 1036324 = 25690^2 + 1018^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 661012393 and 661012402.

It is not an unprimeable number, because it can be changed into a prime (661012427) 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 as a sum of consecutive naturals, namely, 41313269 + ... + 41313284.

Almost surely, 2^661012424 is an apocalyptic number.

It is an amenable number.

661012424 is a deficient number, since it is larger than the sum of its proper divisors (578385886).

661012424 is a wasteful number, since it uses less digits than its factorization.

661012424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82626559 (or 82626555 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 661012424 is about 25710.1618820263. The cubic root of 661012424 is about 871.1037314893.

The spelling of 661012424 in words is "six hundred sixty-one million, twelve thousand, four hundred twenty-four".