2161626516 has 36 divisors (see below), whose sum is σ = 6244699552. Its totient is φ = 617607504.

The previous prime is 2161626479. The next prime is 2161626527. The reversal of 2161626516 is 6156261612.

2161626516 is a `hidden beast` number, since 2 + 1 + 616 + 26 + 5 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4288690 + ... + 4289193.

Almost surely, 2^2161626516 is an apocalyptic number.

It is an amenable number.

2161626516 is an abundant number, since it is smaller than the sum of its proper divisors (4083073036).

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

2161626516 is a wasteful number, since it uses less digits than its factorization.

2161626516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8577900 (or 8577895 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 2161626516 is about 46493.2953876148. The cubic root of 2161626516 is about 1292.9851976564.

The spelling of 2161626516 in words is "two billion, one hundred sixty-one million, six hundred twenty-six thousand, five hundred sixteen".