157788491929 has 16 divisors (see below), whose sum is σ = 162384495120. Its totient is φ = 153269084160.

The previous prime is 157788491897. The next prime is 157788491941. The reversal of 157788491929 is 929194887751.

157788491929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 14628418704 + 143160073225 = 120948^2 + 378365^2 .

It is a cyclic number.

It is not a de Polignac number, because 157788491929 - 2⁵ = 157788491897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157788491429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1563987 + ... + 1661815.

It is an arithmetic number, because the mean of its divisors is an integer number (10149030945).

Almost surely, 2^157788491929 is an apocalyptic number.

It is an amenable number.

157788491929 is a deficient number, since it is larger than the sum of its proper divisors (4596003191).

157788491929 is a wasteful number, since it uses less digits than its factorization.

157788491929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98220.

The product of its digits is 91445760, while the sum is 70.

The spelling of 157788491929 in words is "one hundred fifty-seven billion, seven hundred eighty-eight million, four hundred ninety-one thousand, nine hundred twenty-nine".