661906036 has 12 divisors (see below), whose sum is σ = 1263638880. Its totient is φ = 300866360.

The previous prime is 661906019. The next prime is 661906043. The reversal of 661906036 is 630609166.

It is a junction number, because it is equal to n+sod(n) for n = 661905986 and 661906004.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 7521616 + ... + 7521703.

It is an arithmetic number, because the mean of its divisors is an integer number (105303240).

Almost surely, 2^661906036 is an apocalyptic number.

It is an amenable number.

661906036 is a deficient number, since it is larger than the sum of its proper divisors (601732844).

661906036 is a wasteful number, since it uses less digits than its factorization.

661906036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15043334 (or 15043332 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 661906036 is about 25727.5345884521. The cubic root of 661906036 is about 871.4960984106.

The spelling of 661906036 in words is "six hundred sixty-one million, nine hundred six thousand, thirty-six".