16736509649 has 2 divisors, whose sum is σ = 16736509650. Its totient is φ = 16736509648.

The previous prime is 16736509619. The next prime is 16736509693. The reversal of 16736509649 is 94690563761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14608348225 + 2128161424 = 120865^2 + 46132^2 .

It is a cyclic number.

It is not a de Polignac number, because 16736509649 - 2⁸ = 16736509393 is a prime.

It is a super-2 number, since 2×16736509649² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16736509594 and 16736509603.

It is not a weakly prime, because it can be changed into another prime (16736509619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8368254824 + 8368254825.

It is an arithmetic number, because the mean of its divisors is an integer number (8368254825).

Almost surely, 2^16736509649 is an apocalyptic number.

It is an amenable number.

16736509649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16736509649 is an equidigital number, since it uses as much as digits as its factorization.

16736509649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 56.

The spelling of 16736509649 in words is "sixteen billion, seven hundred thirty-six million, five hundred nine thousand, six hundred forty-nine".