1606405640137 has 4 divisors (see below), whose sum is σ = 1606408760196. Its totient is φ = 1606402520080.

The previous prime is 1606405640131. The next prime is 1606405640197. The reversal of 1606405640137 is 7310465046061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1542039920521 + 64365719616 = 1241789^2 + 253704^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606405640137 - 2⁷ = 1606405640009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1606405640093 and 1606405640102.

It is not an unprimeable number, because it can be changed into a prime (1606405640131) 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, 584314 + ... + 1885267.

It is an arithmetic number, because the mean of its divisors is an integer number (401602190049).

Almost surely, 2^{1606405640137} is an apocalyptic number.

It is an amenable number.

1606405640137 is a deficient number, since it is larger than the sum of its proper divisors (3120059).

1606405640137 is an equidigital number, since it uses as much as digits as its factorization.

1606405640137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120058.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 1606405640137 in words is "one trillion, six hundred six billion, four hundred five million, six hundred forty thousand, one hundred thirty-seven".