16537812493 has 2 divisors, whose sum is σ = 16537812494. Its totient is φ = 16537812492.

The previous prime is 16537812457. The next prime is 16537812509. The reversal of 16537812493 is 39421873561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937310564 + 4600501929 = 109258^2 + 67827^2 .

It is a cyclic number.

It is not a de Polignac number, because 16537812493 - 2⁹ = 16537811981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16537812793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8268906246 + 8268906247.

It is an arithmetic number, because the mean of its divisors is an integer number (8268906247).

Almost surely, 2^16537812493 is an apocalyptic number.

It is an amenable number.

16537812493 is a deficient number, since it is larger than the sum of its proper divisors (1).

16537812493 is an equidigital number, since it uses as much as digits as its factorization.

16537812493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The spelling of 16537812493 in words is "sixteen billion, five hundred thirty-seven million, eight hundred twelve thousand, four hundred ninety-three".