155428008923929 has 27 divisors (see below), whose sum is σ = 181098789516927. Its totient is φ = 133007155311744.

The previous prime is 155428008923917. The next prime is 155428008923977. The reversal of 155428008923929 is 929329800824551.

The square root of 155428008923929 is 12467077.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 131463537720025 + 23964471203904 = 11465755^2 + 4895352^2 .

It is not a de Polignac number, because 155428008923929 - 2⁹ = 155428008923417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155428008923129) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 77059001929 + ... + 77059003945.

It is an arithmetic number, because the mean of its divisors is an integer number (6707362574701).

Almost surely, 2^{155428008923929} is an apocalyptic number.

155428008923929 is the 12467077-th square number.

155428008923929 is the 6233539-th centered octagonal number.

It is an amenable number.

155428008923929 is a deficient number, since it is larger than the sum of its proper divisors (25670780592998).

155428008923929 is an frugal number, since it uses more digits than its factorization.

155428008923929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5814 (or 2907 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 67.

The spelling of 155428008923929 in words is "one hundred fifty-five trillion, four hundred twenty-eight billion, eight million, nine hundred twenty-three thousand, nine hundred twenty-nine".