201657790939 has 4 divisors (see below), whose sum is σ = 219990317400. Its totient is φ = 183325264480.

The previous prime is 201657790921. The next prime is 201657791009. The reversal of 201657790939 is 939097756102.

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

It is a cyclic number.

It is not a de Polignac number, because 201657790939 - 2⁷ = 201657790811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201657790639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9166263214 + ... + 9166263235.

It is an arithmetic number, because the mean of its divisors is an integer number (54997579350).

Almost surely, 2^201657790939 is an apocalyptic number.

201657790939 is a deficient number, since it is larger than the sum of its proper divisors (18332526461).

201657790939 is a wasteful number, since it uses less digits than its factorization.

201657790939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18332526460.

The product of its (nonzero) digits is 6429780, while the sum is 58.

The spelling of 201657790939 in words is "two hundred one billion, six hundred fifty-seven million, seven hundred ninety thousand, nine hundred thirty-nine".