2661142465 has 4 divisors (see below), whose sum is σ = 3193370964. Its totient is φ = 2128913968.

The previous prime is 2661142441. The next prime is 2661142483. The reversal of 2661142465 is 5642411662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1137645441 + 1523497024 = 33729^2 + 39032^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661142465 - 2⁹ = 2661141953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266114242 + ... + 266114251.

It is an arithmetic number, because the mean of its divisors is an integer number (798342741).

Almost surely, 2^2661142465 is an apocalyptic number.

It is an amenable number.

2661142465 is a deficient number, since it is larger than the sum of its proper divisors (532228499).

2661142465 is an equidigital number, since it uses as much as digits as its factorization.

2661142465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532228498.

The product of its digits is 69120, while the sum is 37.

The square root of 2661142465 is about 51586.2623670295. The cubic root of 2661142465 is about 1385.7643198383.

The spelling of 2661142465 in words is "two billion, six hundred sixty-one million, one hundred forty-two thousand, four hundred sixty-five".