155661621408347 has 2 divisors, whose sum is σ = 155661621408348. Its totient is φ = 155661621408346.

The previous prime is 155661621408269. The next prime is 155661621408407. The reversal of 155661621408347 is 743804126166551.

It is a happy number.

155661621408347 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 is a cyclic number.

It is not a de Polignac number, because 155661621408347 - 2¹⁸ = 155661621146203 is a prime.

It is not a weakly prime, because it can be changed into another prime (155661624408347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77830810704173 + 77830810704174.

It is an arithmetic number, because the mean of its divisors is an integer number (77830810704174).

Almost surely, 2^{155661621408347} is an apocalyptic number.

155661621408347 is a deficient number, since it is larger than the sum of its proper divisors (1).

155661621408347 is an equidigital number, since it uses as much as digits as its factorization.

155661621408347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29030400, while the sum is 59.

The spelling of 155661621408347 in words is "one hundred fifty-five trillion, six hundred sixty-one billion, six hundred twenty-one million, four hundred eight thousand, three hundred forty-seven".