201915866851 has 2 divisors, whose sum is σ = 201915866852. Its totient is φ = 201915866850.

The previous prime is 201915866843. The next prime is 201915866903. The reversal of 201915866851 is 158668519102.

It is a happy number.

It is an a-pointer prime, because the next prime (201915866903) can be obtained adding 201915866851 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201915866851 - 2³ = 201915866843 is a prime.

It is not a weakly prime, because it can be changed into another prime (201915866651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100957933425 + 100957933426.

It is an arithmetic number, because the mean of its divisors is an integer number (100957933426).

Almost surely, 2^201915866851 is an apocalyptic number.

201915866851 is a deficient number, since it is larger than the sum of its proper divisors (1).

201915866851 is an equidigital number, since it uses as much as digits as its factorization.

201915866851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 52.

The spelling of 201915866851 in words is "two hundred one billion, nine hundred fifteen million, eight hundred sixty-six thousand, eight hundred fifty-one".