1858661616 has 80 divisors (see below), whose sum is σ = 5521305344. Its totient is φ = 527772672.

The previous prime is 1858661573. The next prime is 1858661621. The reversal of 1858661616 is 6161668581.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 37800 + ... + 71736.

Almost surely, 2^1858661616 is an apocalyptic number.

1858661616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1858661616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2760652672).

1858661616 is an abundant number, since it is smaller than the sum of its proper divisors (3662643728).

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

1858661616 is a wasteful number, since it uses less digits than its factorization.

1858661616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34118 (or 34112 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 1858661616 is about 43112.1979954630. The cubic root of 1858661616 is about 1229.5139013810.

The spelling of 1858661616 in words is "one billion, eight hundred fifty-eight million, six hundred sixty-one thousand, six hundred sixteen".