1661054998 has 8 divisors (see below), whose sum is σ = 2549526408. Its totient is φ = 811212864.

The previous prime is 1661054987. The next prime is 1661055007. The reversal of 1661054998 is 8994501661.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9657211 + ... + 9657382.

It is an arithmetic number, because the mean of its divisors is an integer number (318690801).

Almost surely, 2^1661054998 is an apocalyptic number.

1661054998 is a deficient number, since it is larger than the sum of its proper divisors (888471410).

1661054998 is a wasteful number, since it uses less digits than its factorization.

1661054998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19314638.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 1661054998 is about 40756.0424722519. The cubic root of 1661054998 is about 1184.2989314562.

The spelling of 1661054998 in words is "one billion, six hundred sixty-one million, fifty-four thousand, nine hundred ninety-eight".