20167655549 has 2 divisors, whose sum is σ = 20167655550. Its totient is φ = 20167655548.

The previous prime is 20167655479. The next prime is 20167655561. The reversal of 20167655549 is 94555676102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17764891225 + 2402764324 = 133285^2 + 49018^2 .

It is a cyclic number.

It is not a de Polignac number, because 20167655549 - 2¹⁶ = 20167590013 is a prime.

It is a super-2 number, since 2×20167655549² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20167655497 and 20167655506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20167655569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083827774 + 10083827775.

It is an arithmetic number, because the mean of its divisors is an integer number (10083827775).

Almost surely, 2^20167655549 is an apocalyptic number.

It is an amenable number.

20167655549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20167655549 is an equidigital number, since it uses as much as digits as its factorization.

20167655549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The spelling of 20167655549 in words is "twenty billion, one hundred sixty-seven million, six hundred fifty-five thousand, five hundred forty-nine".