16506423601 has 4 divisors (see below), whose sum is σ = 16565165604. Its totient is φ = 16447681600.

The previous prime is 16506423589. The next prime is 16506423613. The reversal of 16506423601 is 10632460561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10632460561 = 89 ⋅119465849.

It is an interprime number because it is at equal distance from previous prime (16506423589) and next prime (16506423613).

It can be written as a sum of positive squares in 2 ways, for example, as 7004853025 + 9501570576 = 83695^2 + 97476^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506423601 - 2⁷ = 16506423473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16506423301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29370580 + ... + 29371141.

It is an arithmetic number, because the mean of its divisors is an integer number (4141291401).

Almost surely, 2^16506423601 is an apocalyptic number.

It is an amenable number.

16506423601 is a deficient number, since it is larger than the sum of its proper divisors (58742003).

16506423601 is an equidigital number, since it uses as much as digits as its factorization.

16506423601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58742002.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 16506423601 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, six hundred one".