1661076558 has 96 divisors (see below), whose sum is σ = 4064860800. Its totient is φ = 506380896.

The previous prime is 1661076497. The next prime is 1661076569. The reversal of 1661076558 is 8556701661.

1661076558 is a `hidden beast` number, since 16 + 6 + 10 + 76 + 558 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 264685 + ... + 270887.

It is an arithmetic number, because the mean of its divisors is an integer number (42342300).

Almost surely, 2^1661076558 is an apocalyptic number.

1661076558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661076558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2032430400).

1661076558 is an abundant number, since it is smaller than the sum of its proper divisors (2403784242).

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

1661076558 is a wasteful number, since it uses less digits than its factorization.

1661076558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6268 (or 6256 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 1661076558 is about 40756.3069720504. The cubic root of 1661076558 is about 1184.3040553834.

The spelling of 1661076558 in words is "one billion, six hundred sixty-one million, seventy-six thousand, five hundred fifty-eight".