2661011647 has 4 divisors (see below), whose sum is σ = 3041156176. Its totient is φ = 2280867120.

The previous prime is 2661011641. The next prime is 2661011653. The reversal of 2661011647 is 7461101662.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2661011641) and next prime (2661011653).

It is not a de Polignac number, because 2661011647 - 2¹¹ = 2661009599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661011641) 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, 190072254 + ... + 190072267.

It is an arithmetic number, because the mean of its divisors is an integer number (760289044).

Almost surely, 2^2661011647 is an apocalyptic number.

2661011647 is a deficient number, since it is larger than the sum of its proper divisors (380144529).

2661011647 is an equidigital number, since it uses as much as digits as its factorization.

2661011647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380144528.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 2661011647 is about 51584.9943975959. The cubic root of 2661011647 is about 1385.7416120615.

The spelling of 2661011647 in words is "two billion, six hundred sixty-one million, eleven thousand, six hundred forty-seven".