1659125916 has 120 divisors (see below), whose sum is σ = 4981823616. Its totient is φ = 471653280.

The previous prime is 1659125887. The next prime is 1659125947. The reversal of 1659125916 is 6195219561.

It is a happy number.

1659125916 is a `hidden beast` number, since 1 + 6 + 59 + 1 + 2 + 591 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 476815 + ... + 480281.

Almost surely, 2^1659125916 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 1659125916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2490911808).

1659125916 is an abundant number, since it is smaller than the sum of its proper divisors (3322697700).

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

1659125916 is a wasteful number, since it uses less digits than its factorization.

1659125916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3701 (or 3690 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 1659125916 is about 40732.3693884851. The cubic root of 1659125916 is about 1183.8402882560.

The spelling of 1659125916 in words is "one billion, six hundred fifty-nine million, one hundred twenty-five thousand, nine hundred sixteen".