2005661751 has 8 divisors (see below), whose sum is σ = 2831522544. Its totient is φ = 1258454400.

The previous prime is 2005661741. The next prime is 2005661759. The reversal of 2005661751 is 1571665002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2005661751 - 2⁶ = 2005661687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005661759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19663300 + ... + 19663401.

It is an arithmetic number, because the mean of its divisors is an integer number (353940318).

Almost surely, 2^2005661751 is an apocalyptic number.

2005661751 is a deficient number, since it is larger than the sum of its proper divisors (825860793).

2005661751 is a wasteful number, since it uses less digits than its factorization.

2005661751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39326721.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 2005661751 is about 44784.6151150147. The cubic root of 2005661751 is about 1261.1088229971.

The spelling of 2005661751 in words is "two billion, five million, six hundred sixty-one thousand, seven hundred fifty-one".