1655009990 has 16 divisors (see below), whose sum is σ = 3081743280. Its totient is φ = 639176160.

The previous prime is 1655009987. The next prime is 1655010017. The reversal of 1655009990 is 999005561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2853176 + ... + 2853755.

It is an arithmetic number, because the mean of its divisors is an integer number (192608955).

Almost surely, 2^1655009990 is an apocalyptic number.

1655009990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1655009990 is a deficient number, since it is larger than the sum of its proper divisors (1426733290).

1655009990 is a wasteful number, since it uses less digits than its factorization.

1655009990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5706967.

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 1655009990 is about 40681.8139959368. The cubic root of 1655009990 is about 1182.8605286088.

The spelling of 1655009990 in words is "one billion, six hundred fifty-five million, nine thousand, nine hundred ninety".