157645509 has 32 divisors (see below), whose sum is σ = 250281984. Its totient is φ = 86365440.

The previous prime is 157645417. The next prime is 157645513. The reversal of 157645509 is 905546751.

It is not a de Polignac number, because 157645509 - 2⁸ = 157645253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157645559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72492 + ... + 74634.

It is an arithmetic number, because the mean of its divisors is an integer number (7821312).

Almost surely, 2^157645509 is an apocalyptic number.

It is an amenable number.

157645509 is a deficient number, since it is larger than the sum of its proper divisors (92636475).

157645509 is a wasteful number, since it uses less digits than its factorization.

157645509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297.

The product of its (nonzero) digits is 189000, while the sum is 42.

The square root of 157645509 is about 12555.6962769892. The cubic root of 157645509 is about 540.2074066103.

The spelling of 157645509 in words is "one hundred fifty-seven million, six hundred forty-five thousand, five hundred nine".