661099883 has 8 divisors (see below), whose sum is σ = 673654800. Its totient is φ = 648600480.

The previous prime is 661099849. The next prime is 661099913. The reversal of 661099883 is 388990166.

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 661099883 - 2⁶ = 661099819 is a prime.

It is a super-2 number, since 2×661099883² = 874106110605227378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661099823) 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, 10568 + ... + 37866.

It is an arithmetic number, because the mean of its divisors is an integer number (84206850).

Almost surely, 2^661099883 is an apocalyptic number.

661099883 is a deficient number, since it is larger than the sum of its proper divisors (12554917).

661099883 is a wasteful number, since it uses less digits than its factorization.

661099883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27757.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 661099883 is about 25711.8626902059. The cubic root of 661099883 is about 871.1421485693.

The spelling of 661099883 in words is "six hundred sixty-one million, ninety-nine thousand, eight hundred eighty-three".