168646443401761 has 16 divisors (see below), whose sum is σ = 192381642072144. Its totient is φ = 146456245039104.

The previous prime is 168646443401759. The next prime is 168646443401771. The reversal of 168646443401761 is 167104344646861.

It can be written as a sum of positive squares in 8 ways, for example, as 11701830625 + 168634741571136 = 108175^2 + 12985944^2 .

It is not a de Polignac number, because 168646443401761 - 2¹ = 168646443401759 is a prime.

It is a super-2 number, since 2×168646443401761² (a number of 29 digits) contains 22 as substring.

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 168646443401761.

It is not an unprimeable number, because it can be changed into a prime (168646443401701) 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, 156028120 + ... + 157105273.

It is an arithmetic number, because the mean of its divisors is an integer number (12023852629509).

Almost surely, 2^{168646443401761} is an apocalyptic number.

It is an amenable number.

168646443401761 is a deficient number, since it is larger than the sum of its proper divisors (23735198670383).

168646443401761 is a wasteful number, since it uses less digits than its factorization.

168646443401761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313135860.

The product of its (nonzero) digits is 55738368, while the sum is 61.

The spelling of 168646443401761 in words is "one hundred sixty-eight trillion, six hundred forty-six billion, four hundred forty-three million, four hundred one thousand, seven hundred sixty-one".