2661015643 has 16 divisors (see below), whose sum is σ = 3153913056. Its totient is φ = 2213245440.

The previous prime is 2661015641. The next prime is 2661015653. The reversal of 2661015643 is 3465101662.

It is a cyclic number.

It is not a de Polignac number, because 2661015643 - 2¹ = 2661015641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2661015599 and 2661015608.

It is not an unprimeable number, because it can be changed into a prime (2661015641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66180 + ... + 98497.

It is an arithmetic number, because the mean of its divisors is an integer number (197119566).

Almost surely, 2^2661015643 is an apocalyptic number.

2661015643 is a deficient number, since it is larger than the sum of its proper divisors (492897413).

2661015643 is a wasteful number, since it uses less digits than its factorization.

2661015643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164814.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 2661015643 is about 51585.0331297752. The cubic root of 2661015643 is about 1385.7423057101.

The spelling of 2661015643 in words is "two billion, six hundred sixty-one million, fifteen thousand, six hundred forty-three".