155258261817 has 16 divisors (see below), whose sum is σ = 210551640000. Its totient is φ = 101735728704.

The previous prime is 155258261803. The next prime is 155258261819. The reversal of 155258261817 is 718162852551.

It is not a de Polignac number, because 155258261817 - 2¹⁶ = 155258196281 is a prime.

It is a super-2 number, since 2×155258261817² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155258261817.

It is not an unprimeable number, because it can be changed into a prime (155258261819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1166859 + ... + 1293087.

It is an arithmetic number, because the mean of its divisors is an integer number (13159477500).

Almost surely, 2^155258261817 is an apocalyptic number.

It is an amenable number.

155258261817 is a deficient number, since it is larger than the sum of its proper divisors (55293378183).

155258261817 is a wasteful number, since it uses less digits than its factorization.

155258261817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133240.

The product of its digits is 1344000, while the sum is 51.

The spelling of 155258261817 in words is "one hundred fifty-five billion, two hundred fifty-eight million, two hundred sixty-one thousand, eight hundred seventeen".