16523947901 has 2 divisors, whose sum is σ = 16523947902. Its totient is φ = 16523947900.

The previous prime is 16523947889. The next prime is 16523947907. The reversal of 16523947901 is 10974932561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11988060100 + 4535887801 = 109490^2 + 67349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16523947901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16523947907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8261973950 + 8261973951.

It is an arithmetic number, because the mean of its divisors is an integer number (8261973951).

Almost surely, 2^16523947901 is an apocalyptic number.

It is an amenable number.

16523947901 is a deficient number, since it is larger than the sum of its proper divisors (1).

16523947901 is an equidigital number, since it uses as much as digits as its factorization.

16523947901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 16523947901 in words is "sixteen billion, five hundred twenty-three million, nine hundred forty-seven thousand, nine hundred one".