155008663028661 has 32 divisors (see below), whose sum is σ = 234966287485440. Its totient is φ = 90108992217024.

The previous prime is 155008663028641. The next prime is 155008663028683. The reversal of 155008663028661 is 166820366800551.

It is not a de Polignac number, because 155008663028661 - 2¹⁷ = 155008662897589 is a prime.

It is a super-2 number, since 2×155008663028661² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155008663028641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301167195 + ... + 301681448.

It is an arithmetic number, because the mean of its divisors is an integer number (7342696483920).

Almost surely, 2^{155008663028661} is an apocalyptic number.

It is an amenable number.

155008663028661 is a deficient number, since it is larger than the sum of its proper divisors (79957624456779).

155008663028661 is a wasteful number, since it uses less digits than its factorization.

155008663028661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602849025.

The product of its (nonzero) digits is 12441600, while the sum is 57.

The spelling of 155008663028661 in words is "one hundred fifty-five trillion, eight billion, six hundred sixty-three million, twenty-eight thousand, six hundred sixty-one".