155666377 has 2 divisors, whose sum is σ = 155666378. Its totient is φ = 155666376.

The previous prime is 155666359. The next prime is 155666431. The reversal of 155666377 is 773666551.

155666377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99281296 + 56385081 = 9964^2 + 7509^2 .

It is a cyclic number.

It is not a de Polignac number, because 155666377 - 2¹⁹ = 155142089 is a prime.

It is a super-2 number, since 2×155666377² = 48464041856612258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155666317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77833188 + 77833189.

It is an arithmetic number, because the mean of its divisors is an integer number (77833189).

Almost surely, 2^155666377 is an apocalyptic number.

It is an amenable number.

155666377 is a deficient number, since it is larger than the sum of its proper divisors (1).

155666377 is an equidigital number, since it uses as much as digits as its factorization.

155666377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 46.

The square root of 155666377 is about 12476.6332397807. The cubic root of 155666377 is about 537.9372344240.

The spelling of 155666377 in words is "one hundred fifty-five million, six hundred sixty-six thousand, three hundred seventy-seven".