661067770 has 32 divisors (see below), whose sum is σ = 1308851136. Its totient is φ = 240383440.

The previous prime is 661067753. The next prime is 661067783. The reversal of 661067770 is 77760166.

It is a zygodrome in base 7.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11524 + ... + 38143.

It is an arithmetic number, because the mean of its divisors is an integer number (40901598).

Almost surely, 2^661067770 is an apocalyptic number.

661067770 is a deficient number, since it is larger than the sum of its proper divisors (647783366).

661067770 is a wasteful number, since it uses less digits than its factorization.

661067770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49707 (or 49685 counting only the distinct ones).

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 661067770 is about 25711.2382043339. The cubic root of 661067770 is about 871.1280430655.

The spelling of 661067770 in words is "six hundred sixty-one million, sixty-seven thousand, seven hundred seventy".