155512609066 has 4 divisors (see below), whose sum is σ = 233268913602. Its totient is φ = 77756304532.

The previous prime is 155512609051. The next prime is 155512609067. The reversal of 155512609066 is 660906215551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660906215551 = 200357 ⋅3298643.

It can be written as a sum of positive squares in only one way, i.e., 149630486041 + 5882123025 = 386821^2 + 76695^2 .

It is not an unprimeable number, because it can be changed into a prime (155512609067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38878152265 + ... + 38878152268.

Almost surely, 2^155512609066 is an apocalyptic number.

155512609066 is a deficient number, since it is larger than the sum of its proper divisors (77756304536).

155512609066 is an equidigital number, since it uses as much as digits as its factorization.

155512609066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77756304535.

The product of its (nonzero) digits is 486000, while the sum is 46.

The spelling of 155512609066 in words is "one hundred fifty-five billion, five hundred twelve million, six hundred nine thousand, sixty-six".