2051410661 has 4 divisors (see below), whose sum is σ = 2052769824. Its totient is φ = 2050051500.

The previous prime is 2051410649. The next prime is 2051410747. The reversal of 2051410661 is 1660141502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1660141502 = 2 ⋅830070751.

It is a cyclic number.

It is not a de Polignac number, because 2051410661 - 2¹⁰ = 2051409637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2051410661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051410061) 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, 677315 + ... + 680336.

It is an arithmetic number, because the mean of its divisors is an integer number (513192456).

Almost surely, 2^2051410661 is an apocalyptic number.

It is an amenable number.

2051410661 is a deficient number, since it is larger than the sum of its proper divisors (1359163).

2051410661 is a wasteful number, since it uses less digits than its factorization.

2051410661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359162.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2051410661 is about 45292.5011563725. The cubic root of 2051410661 is about 1270.6254098253.

The spelling of 2051410661 in words is "two billion, fifty-one million, four hundred ten thousand, six hundred sixty-one".