157906509697 has 4 divisors (see below), whose sum is σ = 157968412096. Its totient is φ = 157844607300.

The previous prime is 157906509647. The next prime is 157906509737. The reversal of 157906509697 is 796905609751.

It is a happy number.

157906509697 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157906509697 - 2²³ = 157898121089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157906509647) 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 3 ways as a sum of consecutive naturals, for example, 30947373 + ... + 30952474.

It is an arithmetic number, because the mean of its divisors is an integer number (39492103024).

Almost surely, 2^157906509697 is an apocalyptic number.

It is an amenable number.

157906509697 is a deficient number, since it is larger than the sum of its proper divisors (61902399).

157906509697 is an equidigital number, since it uses as much as digits as its factorization.

157906509697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61902398.

The product of its (nonzero) digits is 32148900, while the sum is 64.

The spelling of 157906509697 in words is "one hundred fifty-seven billion, nine hundred six million, five hundred nine thousand, six hundred ninety-seven".