1646117154 has 120 divisors (see below), whose sum is σ = 4109508480. Its totient is φ = 492045840.

The previous prime is 1646117149. The next prime is 1646117167. The reversal of 1646117154 is 4517116461.

1646117154 is a `hidden beast` number, since 1 + 646 + 1 + 1 + 7 + 1 + 5 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1548027 + ... + 1549089.

It is an arithmetic number, because the mean of its divisors is an integer number (34245904).

Almost surely, 2^1646117154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646117154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2054754240).

1646117154 is an abundant number, since it is smaller than the sum of its proper divisors (2463391326).

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

1646117154 is a wasteful number, since it uses less digits than its factorization.

1646117154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178 (or 1158 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1646117154 is about 40572.3693417084. The cubic root of 1646117154 is about 1180.7381080612.

The spelling of 1646117154 in words is "one billion, six hundred forty-six million, one hundred seventeen thousand, one hundred fifty-four".