157215788665 has 16 divisors (see below), whose sum is σ = 205035138000. Its totient is φ = 115032690432.

The previous prime is 157215788647. The next prime is 157215788677. The reversal of 157215788665 is 566887512751.

It is a happy number.

157215788665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 713263849 + 156502524816 = 26707^2 + 395604^2 .

It is a cyclic number.

It is not a de Polignac number, because 157215788665 - 2⁹ = 157215788153 is a prime.

It is a super-3 number, since 3×157215788665³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11087890 + ... + 11102059.

It is an arithmetic number, because the mean of its divisors is an integer number (12814696125).

Almost surely, 2^157215788665 is an apocalyptic number.

It is an amenable number.

157215788665 is a deficient number, since it is larger than the sum of its proper divisors (47819349335).

157215788665 is a wasteful number, since it uses less digits than its factorization.

157215788665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22190076.

The product of its digits is 28224000, while the sum is 61.

The spelling of 157215788665 in words is "one hundred fifty-seven billion, two hundred fifteen million, seven hundred eighty-eight thousand, six hundred sixty-five".