2650161661 has 4 divisors (see below), whose sum is σ = 3028756192. Its totient is φ = 2271567132.

The previous prime is 2650161623. The next prime is 2650161721. The reversal of 2650161661 is 1661610562.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2650161661 - 2¹⁵ = 2650128893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2650161611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189297255 + ... + 189297268.

It is an arithmetic number, because the mean of its divisors is an integer number (757189048).

Almost surely, 2^2650161661 is an apocalyptic number.

It is an amenable number.

2650161661 is a deficient number, since it is larger than the sum of its proper divisors (378594531).

2650161661 is an equidigital number, since it uses as much as digits as its factorization.

2650161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378594530.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 2650161661 is about 51479.7208714266. The cubic root of 2650161661 is about 1383.8556428129.

The spelling of 2650161661 in words is "two billion, six hundred fifty million, one hundred sixty-one thousand, six hundred sixty-one".