661003412 has 12 divisors (see below), whose sum is σ = 1159672500. Its totient is φ = 329668416.

The previous prime is 661003411. The next prime is 661003433. The reversal of 661003412 is 214300166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 250778896 + 410224516 = 15836^2 + 20254^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661003411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206537 + ... + 209712.

It is an arithmetic number, because the mean of its divisors is an integer number (96639375).

Almost surely, 2^661003412 is an apocalyptic number.

It is an amenable number.

661003412 is a deficient number, since it is larger than the sum of its proper divisors (498669088).

661003412 is a wasteful number, since it uses less digits than its factorization.

661003412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416650 (or 416648 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 661003412 is about 25709.9866199887. The cubic root of 661003412 is about 871.0997727022.

Adding to 661003412 its reverse (214300166), we get a palindrome (875303578).

The spelling of 661003412 in words is "six hundred sixty-one million, three thousand, four hundred twelve".