2051723315161 has 16 divisors (see below), whose sum is σ = 2230523124480. Its totient is φ = 1875941303040.

The previous prime is 2051723315153. The next prime is 2051723315189. The reversal of 2051723315161 is 1615133271502.

It is a cyclic number.

It is not a de Polignac number, because 2051723315161 - 2³ = 2051723315153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2051723315161.

It is not an unprimeable number, because it can be changed into a prime (2051723319161) 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, 1863280 + ... + 2752318.

It is an arithmetic number, because the mean of its divisors is an integer number (139407695280).

Almost surely, 2^{2051723315161} is an apocalyptic number.

It is an amenable number.

2051723315161 is a deficient number, since it is larger than the sum of its proper divisors (178799809319).

2051723315161 is a wasteful number, since it uses less digits than its factorization.

2051723315161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890736.

The product of its (nonzero) digits is 37800, while the sum is 37.

Adding to 2051723315161 its reverse (1615133271502), we get a palindrome (3666856586663).

The spelling of 2051723315161 in words is "two trillion, fifty-one billion, seven hundred twenty-three million, three hundred fifteen thousand, one hundred sixty-one".