1659451290 has 64 divisors (see below), whose sum is σ = 4570663680. Its totient is φ = 377717760.

The previous prime is 1659451273. The next prime is 1659451291. The reversal of 1659451290 is 921549561.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1659451291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34216 + ... + 67004.

It is an arithmetic number, because the mean of its divisors is an integer number (71416620).

Almost surely, 2^1659451290 is an apocalyptic number.

1659451290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1659451290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2285331840).

1659451290 is an abundant number, since it is smaller than the sum of its proper divisors (2911212390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1659451290 is a wasteful number, since it uses less digits than its factorization.

1659451290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33047.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 1659451290 is about 40736.3632397395. The cubic root of 1659451290 is about 1183.9176715072.

The spelling of 1659451290 in words is "one billion, six hundred fifty-nine million, four hundred fifty-one thousand, two hundred ninety".