205640157 has 8 divisors (see below), whose sum is σ = 274807584. Its totient is φ = 136783088.

The previous prime is 205640153. The next prime is 205640161. The reversal of 205640157 is 751046502.

205640157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (205640153) and next prime (205640161).

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 205640157 - 2² = 205640153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205640153) 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, 76038 + ... + 78695.

It is an arithmetic number, because the mean of its divisors is an integer number (34350948).

Almost surely, 2^205640157 is an apocalyptic number.

It is an amenable number.

205640157 is a deficient number, since it is larger than the sum of its proper divisors (69167427).

205640157 is a wasteful number, since it uses less digits than its factorization.

205640157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155179.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 205640157 is about 14340.1588903331. The cubic root of 205640157 is about 590.2499725976.

Adding to 205640157 its reverse (751046502), we get a palindrome (956686659).

The spelling of 205640157 in words is "two hundred five million, six hundred forty thousand, one hundred fifty-seven".