155249071988 has 6 divisors (see below), whose sum is σ = 271685875986. Its totient is φ = 77624535992.

The previous prime is 155249071979. The next prime is 155249072039. The reversal of 155249071988 is 889170942551.

It can be written as a sum of positive squares in only one way, i.e., 130854380644 + 24394691344 = 361738^2 + 156188^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19406133995 + ... + 19406134002.

It is an arithmetic number, because the mean of its divisors is an integer number (45280979331).

Almost surely, 2^155249071988 is an apocalyptic number.

It is an amenable number.

155249071988 is a deficient number, since it is larger than the sum of its proper divisors (116436803998).

155249071988 is a wasteful number, since it uses less digits than its factorization.

155249071988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38812268001 (or 38812267999 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 59.

The spelling of 155249071988 in words is "one hundred fifty-five billion, two hundred forty-nine million, seventy-one thousand, nine hundred eighty-eight".