157643506 has 4 divisors (see below), whose sum is σ = 236465262. Its totient is φ = 78821752.

The previous prime is 157643503. The next prime is 157643509. The reversal of 157643506 is 605346751.

157643506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (157643503) and next prime (157643509).

It can be written as a sum of positive squares in only one way, i.e., 123010281 + 34633225 = 11091^2 + 5885^2 .

It is not an unprimeable number, because it can be changed into a prime (157643503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39410875 + ... + 39410878.

Almost surely, 2^157643506 is an apocalyptic number.

157643506 is a deficient number, since it is larger than the sum of its proper divisors (78821756).

157643506 is an equidigital number, since it uses as much as digits as its factorization.

157643506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78821755.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 157643506 is about 12555.6165121431. The cubic root of 157643506 is about 540.2051186923.

The spelling of 157643506 in words is "one hundred fifty-seven million, six hundred forty-three thousand, five hundred six".