155401175729 has 2 divisors, whose sum is σ = 155401175730. Its totient is φ = 155401175728.

The previous prime is 155401175701. The next prime is 155401175753. The reversal of 155401175729 is 927571104551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153466495504 + 1934680225 = 391748^2 + 43985^2 .

It is a cyclic number.

It is not a de Polignac number, because 155401175729 - 2¹² = 155401171633 is a prime.

It is not a weakly prime, because it can be changed into another prime (155401175779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77700587864 + 77700587865.

It is an arithmetic number, because the mean of its divisors is an integer number (77700587865).

Almost surely, 2^155401175729 is an apocalyptic number.

It is an amenable number.

155401175729 is a deficient number, since it is larger than the sum of its proper divisors (1).

155401175729 is an equidigital number, since it uses as much as digits as its factorization.

155401175729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 441000, while the sum is 47.

The spelling of 155401175729 in words is "one hundred fifty-five billion, four hundred one million, one hundred seventy-five thousand, seven hundred twenty-nine".