16785291077 has 2 divisors, whose sum is σ = 16785291078. Its totient is φ = 16785291076.

The previous prime is 16785291059. The next prime is 16785291143. The reversal of 16785291077 is 77019258761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13473173476 + 3312117601 = 116074^2 + 57551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16785291077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16785294077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8392645538 + 8392645539.

It is an arithmetic number, because the mean of its divisors is an integer number (8392645539).

Almost surely, 2^16785291077 is an apocalyptic number.

It is an amenable number.

16785291077 is a deficient number, since it is larger than the sum of its proper divisors (1).

16785291077 is an equidigital number, since it uses as much as digits as its factorization.

16785291077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1481760, while the sum is 53.

The spelling of 16785291077 in words is "sixteen billion, seven hundred eighty-five million, two hundred ninety-one thousand, seventy-seven".