157666673 has 8 divisors (see below), whose sum is σ = 159019848. Its totient is φ = 156319744.

The previous prime is 157666643. The next prime is 157666741. The reversal of 157666673 is 376666751.

It can be written as a sum of positive squares in 4 ways, for example, as 21641104 + 136025569 = 4652^2 + 11663^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 157666673 - 2⁶ = 157666609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157666603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58565 + ... + 61197.

It is an arithmetic number, because the mean of its divisors is an integer number (19877481).

Almost surely, 2^157666673 is an apocalyptic number.

It is an amenable number.

157666673 is a deficient number, since it is larger than the sum of its proper divisors (1353175).

157666673 is a wasteful number, since it uses less digits than its factorization.

157666673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123.

The product of its digits is 952560, while the sum is 47.

The square root of 157666673 is about 12556.5390534175. The cubic root of 157666673 is about 540.2315799133.

The spelling of 157666673 in words is "one hundred fifty-seven million, six hundred sixty-six thousand, six hundred seventy-three".