16540163261 has 2 divisors, whose sum is σ = 16540163262. Its totient is φ = 16540163260.

The previous prime is 16540163257. The next prime is 16540163279. The reversal of 16540163261 is 16236104561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10296160900 + 6244002361 = 101470^2 + 79019^2 .

It is a cyclic number.

It is not a de Polignac number, because 16540163261 - 2² = 16540163257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16540163231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8270081630 + 8270081631.

It is an arithmetic number, because the mean of its divisors is an integer number (8270081631).

Almost surely, 2^16540163261 is an apocalyptic number.

It is an amenable number.

16540163261 is a deficient number, since it is larger than the sum of its proper divisors (1).

16540163261 is an equidigital number, since it uses as much as digits as its factorization.

16540163261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 16540163261 in words is "sixteen billion, five hundred forty million, one hundred sixty-three thousand, two hundred sixty-one".