1658881868 has 72 divisors (see below), whose sum is σ = 3568783680. Its totient is φ = 670874400.

The previous prime is 1658881859. The next prime is 1658881871. The reversal of 1658881868 is 8681888561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1142543 + ... + 1143993.

It is an arithmetic number, because the mean of its divisors is an integer number (49566440).

Almost surely, 2^1658881868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1658881868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1784391840).

1658881868 is an abundant number, since it is smaller than the sum of its proper divisors (1909901812).

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

1658881868 is a wasteful number, since it uses less digits than its factorization.

1658881868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795 (or 1786 counting only the distinct ones).

The product of its digits is 5898240, while the sum is 59.

The square root of 1658881868 is about 40729.3735282044. The cubic root of 1658881868 is about 1183.7822400153.

The spelling of 1658881868 in words is "one billion, six hundred fifty-eight million, eight hundred eighty-one thousand, eight hundred sixty-eight".