216369028957 has 2 divisors, whose sum is σ = 216369028958. Its totient is φ = 216369028956.

The previous prime is 216369028937. The next prime is 216369028999. The reversal of 216369028957 is 759820963612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135079035961 + 81289992996 = 367531^2 + 285114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216369028957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216369028927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108184514478 + 108184514479.

It is an arithmetic number, because the mean of its divisors is an integer number (108184514479).

Almost surely, 2^216369028957 is an apocalyptic number.

It is an amenable number.

216369028957 is a deficient number, since it is larger than the sum of its proper divisors (1).

216369028957 is an equidigital number, since it uses as much as digits as its factorization.

216369028957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 216369028957 in words is "two hundred sixteen billion, three hundred sixty-nine million, twenty-eight thousand, nine hundred fifty-seven".