2005661451 has 16 divisors (see below), whose sum is σ = 2827382400. Its totient is φ = 1261145088.

The previous prime is 2005661443. The next prime is 2005661453. The reversal of 2005661451 is 1541665002.

It is not a de Polignac number, because 2005661451 - 2³ = 2005661443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2005661453) 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, 64566 + ... + 90443.

It is an arithmetic number, because the mean of its divisors is an integer number (176711400).

Almost surely, 2^2005661451 is an apocalyptic number.

2005661451 is a deficient number, since it is larger than the sum of its proper divisors (821720949).

2005661451 is a wasteful number, since it uses less digits than its factorization.

2005661451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155258.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 2005661451 is about 44784.6117656500. The cubic root of 2005661451 is about 1261.1087601196.

The spelling of 2005661451 in words is "two billion, five million, six hundred sixty-one thousand, four hundred fifty-one".