201655561963 has 2 divisors, whose sum is σ = 201655561964. Its totient is φ = 201655561962.

The previous prime is 201655561957. The next prime is 201655561997. The reversal of 201655561963 is 369165556102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201655561963 - 2⁵ = 201655561931 is a prime.

It is a super-2 number, since 2×201655561963² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201655561463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100827780981 + 100827780982.

It is an arithmetic number, because the mean of its divisors is an integer number (100827780982).

Almost surely, 2^201655561963 is an apocalyptic number.

201655561963 is a deficient number, since it is larger than the sum of its proper divisors (1).

201655561963 is an equidigital number, since it uses as much as digits as its factorization.

201655561963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 49.

The spelling of 201655561963 in words is "two hundred one billion, six hundred fifty-five million, five hundred sixty-one thousand, nine hundred sixty-three".