16677172071961 has 2 divisors, whose sum is σ = 16677172071962. Its totient is φ = 16677172071960.

The previous prime is 16677172071949. The next prime is 16677172072031. The reversal of 16677172071961 is 16917027177661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13249745600400 + 3427426471561 = 3640020^2 + 1851331^2 .

It is a cyclic number.

It is not a de Polignac number, because 16677172071961 - 2⁹ = 16677172071449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16677172071961.

It is not a weakly prime, because it can be changed into another prime (16677172072961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8338586035980 + 8338586035981.

It is an arithmetic number, because the mean of its divisors is an integer number (8338586035981).

Almost surely, 2^{16677172071961} is an apocalyptic number.

It is an amenable number.

16677172071961 is a deficient number, since it is larger than the sum of its proper divisors (1).

16677172071961 is an equidigital number, since it uses as much as digits as its factorization.

16677172071961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9335088, while the sum is 61.

The spelling of 16677172071961 in words is "sixteen trillion, six hundred seventy-seven billion, one hundred seventy-two million, seventy-one thousand, nine hundred sixty-one".