661499967 has 8 divisors (see below), whose sum is σ = 885354624. Its totient is φ = 439322648.

The previous prime is 661499929. The next prime is 661499977. The reversal of 661499967 is 769994166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661499967 - 2¹² = 661495871 is a prime.

It is a super-3 number, since 3×661499967³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661499977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418413 + ... + 419990.

It is an arithmetic number, because the mean of its divisors is an integer number (110669328).

Almost surely, 2^661499967 is an apocalyptic number.

661499967 is a deficient number, since it is larger than the sum of its proper divisors (223854657).

661499967 is a wasteful number, since it uses less digits than its factorization.

661499967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838669.

The product of its digits is 4408992, while the sum is 57.

The square root of 661499967 is about 25719.6416576903. The cubic root of 661499967 is about 871.3178455455.

The spelling of 661499967 in words is "six hundred sixty-one million, four hundred ninety-nine thousand, nine hundred sixty-seven".