16542621413 has 2 divisors, whose sum is σ = 16542621414. Its totient is φ = 16542621412.

The previous prime is 16542621383. The next prime is 16542621463. The reversal of 16542621413 is 31412624561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16536159649 + 6461764 = 128593^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 16542621413 - 2¹² = 16542617317 is a prime.

It is a super-2 number, since 2×16542621413² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16542621463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8271310706 + 8271310707.

It is an arithmetic number, because the mean of its divisors is an integer number (8271310707).

Almost surely, 2^16542621413 is an apocalyptic number.

It is an amenable number.

16542621413 is a deficient number, since it is larger than the sum of its proper divisors (1).

16542621413 is an equidigital number, since it uses as much as digits as its factorization.

16542621413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The spelling of 16542621413 in words is "sixteen billion, five hundred forty-two million, six hundred twenty-one thousand, four hundred thirteen".