651442115161 has 4 divisors (see below), whose sum is σ = 669048658852. Its totient is φ = 633835571472.

The previous prime is 651442115111. The next prime is 651442115167. The reversal of 651442115161 is 161511244156.

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 444035649600 + 207406465561 = 666360^2 + 455419^2 .

It is a cyclic number.

It is not a de Polignac number, because 651442115161 - 2¹³ = 651442106969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 17606543653 = 651442115161 / (6 + 5 + 1 + 4 + 4 + 2 + 1 + 1 + 5 + 1 + 6 + 1).

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 651442115161.

It is not an unprimeable number, because it can be changed into a prime (651442115167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8803271790 + ... + 8803271863.

It is an arithmetic number, because the mean of its divisors is an integer number (167262164713).

Almost surely, 2^651442115161 is an apocalyptic number.

It is an amenable number.

651442115161 is a deficient number, since it is larger than the sum of its proper divisors (17606543691).

651442115161 is a wasteful number, since it uses less digits than its factorization.

651442115161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17606543690.

The product of its digits is 28800, while the sum is 37.

The spelling of 651442115161 in words is "six hundred fifty-one billion, four hundred forty-two million, one hundred fifteen thousand, one hundred sixty-one".