155666788 has 6 divisors (see below), whose sum is σ = 272416886. Its totient is φ = 77833392.

The previous prime is 155666767. The next prime is 155666789. The reversal of 155666788 is 887666551.

155666788 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 148060224 + 7606564 = 12168^2 + 2758^2 .

155666788 is strictly pandigital in base 9.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (155666789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19458345 + ... + 19458352.

Almost surely, 2^155666788 is an apocalyptic number.

It is an amenable number.

155666788 is a deficient number, since it is larger than the sum of its proper divisors (116750098).

155666788 is a wasteful number, since it uses less digits than its factorization.

155666788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38916701 (or 38916699 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 52.

The square root of 155666788 is about 12476.6497105593. The cubic root of 155666788 is about 537.9377078553.

The spelling of 155666788 in words is "one hundred fifty-five million, six hundred sixty-six thousand, seven hundred eighty-eight".