16878070549 has 2 divisors, whose sum is σ = 16878070550. Its totient is φ = 16878070548.

The previous prime is 16878070507. The next prime is 16878070637. The reversal of 16878070549 is 94507087861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8696868049 + 8181202500 = 93257^2 + 90450^2 .

It is a cyclic number.

It is not a de Polignac number, because 16878070549 - 2⁷ = 16878070421 is a prime.

It is a super-2 number, since 2×16878070549² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16878070549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16878070049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8439035274 + 8439035275.

It is an arithmetic number, because the mean of its divisors is an integer number (8439035275).

Almost surely, 2^16878070549 is an apocalyptic number.

It is an amenable number.

16878070549 is a deficient number, since it is larger than the sum of its proper divisors (1).

16878070549 is an equidigital number, since it uses as much as digits as its factorization.

16878070549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 16878070549 in words is "sixteen billion, eight hundred seventy-eight million, seventy thousand, five hundred forty-nine".