661928267 has 16 divisors (see below), whose sum is σ = 888744192. Its totient is φ = 476111520.

The previous prime is 661928249. The next prime is 661928297. The reversal of 661928267 is 762829166.

It is a cyclic number.

It is not a de Polignac number, because 661928267 - 2⁶ = 661928203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661928207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329633 + ... + 331634.

It is an arithmetic number, because the mean of its divisors is an integer number (55546512).

Almost surely, 2^661928267 is an apocalyptic number.

661928267 is a deficient number, since it is larger than the sum of its proper divisors (226815925).

661928267 is a wasteful number, since it uses less digits than its factorization.

661928267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661298.

The product of its digits is 435456, while the sum is 47.

The square root of 661928267 is about 25727.9666316637. The cubic root of 661928267 is about 871.5058550890.

The spelling of 661928267 in words is "six hundred sixty-one million, nine hundred twenty-eight thousand, two hundred sixty-seven".