157666763391 has 8 divisors (see below), whose sum is σ = 211512059520. Its totient is φ = 104466321432.

The previous prime is 157666763351. The next prime is 157666763399. The reversal of 157666763391 is 193367666751.

It is a happy number.

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

It is not a de Polignac number, because 157666763391 - 2⁶ = 157666763327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157666763399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161212971 + ... + 161213948.

It is an arithmetic number, because the mean of its divisors is an integer number (26439007440).

Almost surely, 2^157666763391 is an apocalyptic number.

157666763391 is a deficient number, since it is larger than the sum of its proper divisors (53845296129).

157666763391 is a wasteful number, since it uses less digits than its factorization.

157666763391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322427085.

The product of its digits is 25719120, while the sum is 60.

The spelling of 157666763391 in words is "one hundred fifty-seven billion, six hundred sixty-six million, seven hundred sixty-three thousand, three hundred ninety-one".