661498299 has 32 divisors (see below), whose sum is σ = 1221818880. Its totient is φ = 343634400.

The previous prime is 661498291. The next prime is 661498301. The reversal of 661498299 is 992894166.

661498299 is a `hidden beast` number, since 6 + 61 + 498 + 2 + 99 = 666.

It is not a de Polignac number, because 661498299 - 2³ = 661498291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661498291) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 157012 + ... + 161169.

It is an arithmetic number, because the mean of its divisors is an integer number (38181840).

Almost surely, 2^661498299 is an apocalyptic number.

661498299 is a deficient number, since it is larger than the sum of its proper divisors (560320581).

661498299 is a wasteful number, since it uses less digits than its factorization.

661498299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318208 (or 318202 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 661498299 is about 25719.6092310906. The cubic root of 661498299 is about 871.3171131900.

The spelling of 661498299 in words is "six hundred sixty-one million, four hundred ninety-eight thousand, two hundred ninety-nine".