155978027 has 2 divisors, whose sum is σ = 155978028. Its totient is φ = 155978026.

The previous prime is 155978003. The next prime is 155978029. The reversal of 155978027 is 720879551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155978027 - 2⁶ = 155977963 is a prime.

Together with 155978029, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155978029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77989013 + 77989014.

It is an arithmetic number, because the mean of its divisors is an integer number (77989014).

Almost surely, 2^155978027 is an apocalyptic number.

155978027 is a deficient number, since it is larger than the sum of its proper divisors (1).

155978027 is an equidigital number, since it uses as much as digits as its factorization.

155978027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 44.

The square root of 155978027 is about 12489.1163418394. The cubic root of 155978027 is about 538.2959853787.

The spelling of 155978027 in words is "one hundred fifty-five million, nine hundred seventy-eight thousand, twenty-seven".