1661309498 has 8 divisors (see below), whose sum is σ = 2623120320. Its totient is φ = 786936060.

The previous prime is 1661309483. The next prime is 1661309501. The reversal of 1661309498 is 8949031661.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21859298 + ... + 21859373.

It is an arithmetic number, because the mean of its divisors is an integer number (327890040).

Almost surely, 2^1661309498 is an apocalyptic number.

1661309498 is a deficient number, since it is larger than the sum of its proper divisors (961810822).

1661309498 is a wasteful number, since it uses less digits than its factorization.

1661309498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43718692.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1661309498 is about 40759.1645890835. The cubic root of 1661309498 is about 1184.3594128343.

The spelling of 1661309498 in words is "one billion, six hundred sixty-one million, three hundred nine thousand, four hundred ninety-eight".