3691561716 has 144 divisors (see below), whose sum is σ = 10096439808. Its totient is φ = 1178064000.

The previous prime is 3691561697. The next prime is 3691561733. The reversal of 3691561716 is 6171651963.

3691561716 is a `hidden beast` number, since 3 + 6 + 9 + 15 + 617 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3042726 + ... + 3043938.

Almost surely, 2^3691561716 is an apocalyptic number.

3691561716 is a gapful number since it is divisible by the number (36) 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 3691561716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5048219904).

3691561716 is an abundant number, since it is smaller than the sum of its proper divisors (6404878092).

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

3691561716 is a wasteful number, since it uses less digits than its factorization.

3691561716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364 (or 1350 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 3691561716 is about 60758.2234434155. The cubic root of 3691561716 is about 1545.5036834535.

The spelling of 3691561716 in words is "three billion, six hundred ninety-one million, five hundred sixty-one thousand, seven hundred sixteen".