155666101 has 2 divisors, whose sum is σ = 155666102. Its totient is φ = 155666100.

The previous prime is 155666057. The next prime is 155666123. The reversal of 155666101 is 101666551.

155666101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139263601 + 16402500 = 11801^2 + 4050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155666101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155666191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77833050 + 77833051.

It is an arithmetic number, because the mean of its divisors is an integer number (77833051).

Almost surely, 2^155666101 is an apocalyptic number.

It is an amenable number.

155666101 is a deficient number, since it is larger than the sum of its proper divisors (1).

155666101 is an equidigital number, since it uses as much as digits as its factorization.

155666101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 155666101 is about 12476.6221790996. The cubic root of 155666101 is about 537.9369164989.

The spelling of 155666101 in words is "one hundred fifty-five million, six hundred sixty-six thousand, one hundred one".