16783074172657 has 16 divisors (see below), whose sum is σ = 18726839102160. Its totient is φ = 14939971264512.

The previous prime is 16783074172639. The next prime is 16783074172687. The reversal of 16783074172657 is 75627147038761.

It can be written as a sum of positive squares in 8 ways, for example, as 3127270391281 + 13655803781376 = 1768409^2 + 3695376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16783074172657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16783074172607) 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, 154335232 + ... + 154443937.

It is an arithmetic number, because the mean of its divisors is an integer number (1170427443885).

Almost surely, 2^{16783074172657} is an apocalyptic number.

It is an amenable number.

16783074172657 is a deficient number, since it is larger than the sum of its proper divisors (1943764929503).

16783074172657 is a wasteful number, since it uses less digits than its factorization.

16783074172657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308779332.

The product of its (nonzero) digits is 82978560, while the sum is 64.

The spelling of 16783074172657 in words is "sixteen trillion, seven hundred eighty-three billion, seventy-four million, one hundred seventy-two thousand, six hundred fifty-seven".