2161615744 has 16 divisors (see below), whose sum is σ = 4306344120. Its totient is φ = 1080807808.

The previous prime is 2161615723. The next prime is 2161615747. The reversal of 2161615744 is 4475161612.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-3 number, since 3×2161615744³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161615747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8443684 + ... + 8443939.

Almost surely, 2^2161615744 is an apocalyptic number.

It is an amenable number.

2161615744 is a deficient number, since it is larger than the sum of its proper divisors (2144728376).

2161615744 is an equidigital number, since it uses as much as digits as its factorization.

2161615744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16887637 (or 16887625 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 2161615744 is about 46493.1795428104. The cubic root of 2161615744 is about 1292.9830498818.

The spelling of 2161615744 in words is "two billion, one hundred sixty-one million, six hundred fifteen thousand, seven hundred forty-four".