155103661 has 2 divisors, whose sum is σ = 155103662. Its totient is φ = 155103660.

The previous prime is 155103659. The next prime is 155103701. The reversal of 155103661 is 166301551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145684900 + 9418761 = 12070^2 + 3069^2 .

It is a cyclic number.

It is not a de Polignac number, because 155103661 - 2¹ = 155103659 is a prime.

Together with 155103659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155103601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77551830 + 77551831.

It is an arithmetic number, because the mean of its divisors is an integer number (77551831).

Almost surely, 2^155103661 is an apocalyptic number.

It is an amenable number.

155103661 is a deficient number, since it is larger than the sum of its proper divisors (1).

155103661 is an equidigital number, since it uses as much as digits as its factorization.

155103661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 155103661 is about 12454.0620281095. The cubic root of 155103661 is about 537.2882581156.

The spelling of 155103661 in words is "one hundred fifty-five million, one hundred three thousand, six hundred sixty-one".