661015016 has 16 divisors (see below), whose sum is σ = 1304635200. Its totient is φ = 313112304.

The previous prime is 661015013. The next prime is 661015087. The reversal of 661015016 is 610510166.

661015016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661015013) 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, 2174240 + ... + 2174543.

It is an arithmetic number, because the mean of its divisors is an integer number (81539700).

Almost surely, 2^661015016 is an apocalyptic number.

It is an amenable number.

661015016 is a deficient number, since it is larger than the sum of its proper divisors (643620184).

661015016 is a wasteful number, since it uses less digits than its factorization.

661015016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4348808 (or 4348804 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 661015016 is about 25710.2122900609. The cubic root of 661015016 is about 871.1048700952.

It can be divided in two parts, 6610150 and 16, that added together give a palindrome (6610166).

The spelling of 661015016 in words is "six hundred sixty-one million, fifteen thousand, sixteen".