155548639387 has 2 divisors, whose sum is σ = 155548639388. Its totient is φ = 155548639386.

The previous prime is 155548639319. The next prime is 155548639427. The reversal of 155548639387 is 783936845551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155548639387 is a prime.

It is not a weakly prime, because it can be changed into another prime (155542639387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77774319693 + 77774319694.

It is an arithmetic number, because the mean of its divisors is an integer number (77774319694).

Almost surely, 2^155548639387 is an apocalyptic number.

155548639387 is a deficient number, since it is larger than the sum of its proper divisors (1).

155548639387 is an equidigital number, since it uses as much as digits as its factorization.

155548639387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864000, while the sum is 64.

The spelling of 155548639387 in words is "one hundred fifty-five billion, five hundred forty-eight million, six hundred thirty-nine thousand, three hundred eighty-seven".