157321432666 has 8 divisors (see below), whose sum is σ = 237285918324. Its totient is φ = 78226126560.

The previous prime is 157321432661. The next prime is 157321432703. The reversal of 157321432666 is 666234123751.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 155180057041 + 2141375625 = 393929^2 + 46275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×157321432666³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (157321432661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217294435 + ... + 217295158.

Almost surely, 2^157321432666 is an apocalyptic number.

157321432666 is a deficient number, since it is larger than the sum of its proper divisors (79964485658).

157321432666 is a wasteful number, since it uses less digits than its factorization.

157321432666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434589776.

The product of its digits is 1088640, while the sum is 46.

The spelling of 157321432666 in words is "one hundred fifty-seven billion, three hundred twenty-one million, four hundred thirty-two thousand, six hundred sixty-six".