1659011990 has 16 divisors (see below), whose sum is σ = 3089195280. Its totient is φ = 640721760.

The previous prime is 1659011983. The next prime is 1659011993. The reversal of 1659011990 is 991109561.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659011993) 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, 2860076 + ... + 2860655.

It is an arithmetic number, because the mean of its divisors is an integer number (193074705).

Almost surely, 2^1659011990 is an apocalyptic number.

1659011990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1659011990 is a deficient number, since it is larger than the sum of its proper divisors (1430183290).

1659011990 is a wasteful number, since it uses less digits than its factorization.

1659011990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5720767.

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 1659011990 is about 40730.9708943944. The cubic root of 1659011990 is about 1183.8131910007.

The spelling of 1659011990 in words is "one billion, six hundred fifty-nine million, eleven thousand, nine hundred ninety".