201545634779 has 2 divisors, whose sum is σ = 201545634780. Its totient is φ = 201545634778.

The previous prime is 201545634629. The next prime is 201545634799. The reversal of 201545634779 is 977436545102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201545634779 - 2¹² = 201545630683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201545634779.

It is not a weakly prime, because it can be changed into another prime (201545634799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100772817389 + 100772817390.

It is an arithmetic number, because the mean of its divisors is an integer number (100772817390).

Almost surely, 2^201545634779 is an apocalyptic number.

201545634779 is a deficient number, since it is larger than the sum of its proper divisors (1).

201545634779 is an equidigital number, since it uses as much as digits as its factorization.

201545634779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 201545634779 in words is "two hundred one billion, five hundred forty-five million, six hundred thirty-four thousand, seven hundred seventy-nine".