157908129001666 has 4 divisors (see below), whose sum is σ = 236862193502502. Its totient is φ = 78954064500832.

The previous prime is 157908129001633. The next prime is 157908129001717. The reversal of 157908129001666 is 666100921809751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 156650781672441 + 1257347329225 = 12516021^2 + 1121315^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39477032250415 + ... + 39477032250418.

Almost surely, 2^{157908129001666} is an apocalyptic number.

157908129001666 is a deficient number, since it is larger than the sum of its proper divisors (78954064500836).

157908129001666 is an equidigital number, since it uses as much as digits as its factorization.

157908129001666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78954064500835.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 157908129001666 in words is "one hundred fifty-seven trillion, nine hundred eight billion, one hundred twenty-nine million, one thousand, six hundred sixty-six".