155494788728 has 8 divisors (see below), whose sum is σ = 291552728880. Its totient is φ = 77747394360.

The previous prime is 155494788721. The next prime is 155494788733. The reversal of 155494788728 is 827887494551.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155494788721) by changing a digit.

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, 9718424288 + ... + 9718424303.

It is an arithmetic number, because the mean of its divisors is an integer number (36444091110).

Almost surely, 2^155494788728 is an apocalyptic number.

It is an amenable number.

155494788728 is a deficient number, since it is larger than the sum of its proper divisors (136057940152).

155494788728 is a wasteful number, since it uses less digits than its factorization.

155494788728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19436848597 (or 19436848593 counting only the distinct ones).

The product of its digits is 180633600, while the sum is 68.

The spelling of 155494788728 in words is "one hundred fifty-five billion, four hundred ninety-four million, seven hundred eighty-eight thousand, seven hundred twenty-eight".