155716031976129 has 9 divisors (see below), whose sum is σ = 224923211372899. Its totient is φ = 103810663026840.

The previous prime is 155716031976119. The next prime is 155716031976143. The reversal of 155716031976129 is 921679130617551.

The square root of 155716031976129 is 12478623.

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

155716031976129 is a `hidden beast` number, since 1 + 5 + 5 + 7 + 1 + 6 + 0 + 3 + 1 + 9 + 7 + 612 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 82220045895729 + 73495986080400 = 9067527^2 + 8572980^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 155716031976129 - 2²³ = 155716023587521 is a prime.

It is a super-2 number, since 2×155716031976129² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155716031976119) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35356099 + ... + 39515639.

Almost surely, 2^{155716031976129} is an apocalyptic number.

155716031976129 is the 12478623-rd square number.

155716031976129 is the 6239312-nd centered octagonal number.

It is an amenable number.

155716031976129 is a deficient number, since it is larger than the sum of its proper divisors (69207179396770).

155716031976129 is an frugal number, since it uses more digits than its factorization.

155716031976129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319088 (or 4159544 counting only the distinct ones).

The product of its (nonzero) digits is 21432600, while the sum is 63.

The spelling of 155716031976129 in words is "one hundred fifty-five trillion, seven hundred sixteen billion, thirty-one million, nine hundred seventy-six thousand, one hundred twenty-nine".