201856765723 has 4 divisors (see below), whose sum is σ = 203193565648. Its totient is φ = 200519965800.

The previous prime is 201856765717. The next prime is 201856765729. The reversal of 201856765723 is 327567658102.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (201856765717) and next prime (201856765729).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201856765723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201856765729) 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, 668399736 + ... + 668400037.

It is an arithmetic number, because the mean of its divisors is an integer number (50798391412).

Almost surely, 2^201856765723 is an apocalyptic number.

201856765723 is a deficient number, since it is larger than the sum of its proper divisors (1336799925).

201856765723 is a wasteful number, since it uses less digits than its factorization.

201856765723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336799924.

The product of its (nonzero) digits is 4233600, while the sum is 52.

The spelling of 201856765723 in words is "two hundred one billion, eight hundred fifty-six million, seven hundred sixty-five thousand, seven hundred twenty-three".