2640308161 has 32 divisors (see below), whose sum is σ = 2965248000. Its totient is φ = 2341194240.

The previous prime is 2640308149. The next prime is 2640308183. The reversal of 2640308161 is 1618030462.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2640308161 - 2¹¹ = 2640306113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640308861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3080445 + ... + 3081301.

It is an arithmetic number, because the mean of its divisors is an integer number (92664000).

Almost surely, 2^2640308161 is an apocalyptic number.

It is an amenable number.

2640308161 is a deficient number, since it is larger than the sum of its proper divisors (324939839).

2640308161 is a wasteful number, since it uses less digits than its factorization.

2640308161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 2640308161 is about 51383.9290148194. The cubic root of 2640308161 is about 1382.1384197416.

The spelling of 2640308161 in words is "two billion, six hundred forty million, three hundred eight thousand, one hundred sixty-one".