1684016781157 has 2 divisors, whose sum is σ = 1684016781158. Its totient is φ = 1684016781156.

The previous prime is 1684016781053. The next prime is 1684016781221. The reversal of 1684016781157 is 7511876104861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 905949890596 + 778066890561 = 951814^2 + 882081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1684016781157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1684016781098 and 1684016781107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684016787157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842008390578 + 842008390579.

It is an arithmetic number, because the mean of its divisors is an integer number (842008390579).

Almost surely, 2^{1684016781157} is an apocalyptic number.

It is an amenable number.

1684016781157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684016781157 is an equidigital number, since it uses as much as digits as its factorization.

1684016781157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 55.

The spelling of 1684016781157 in words is "one trillion, six hundred eighty-four billion, sixteen million, seven hundred eighty-one thousand, one hundred fifty-seven".