1636005615645 has 16 divisors (see below), whose sum is σ = 2619275228352. Its totient is φ = 871980913920.

The previous prime is 1636005615619. The next prime is 1636005615649. The reversal of 1636005615645 is 5465165006361.

It is not a de Polignac number, because 1636005615645 - 2⁵ = 1636005615613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1636005615594 and 1636005615603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636005615649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34689052 + ... + 34736181.

It is an arithmetic number, because the mean of its divisors is an integer number (163704701772).

Almost surely, 2^{1636005615645} is an apocalyptic number.

1636005615645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1636005615645 is a deficient number, since it is larger than the sum of its proper divisors (983269612707).

1636005615645 is a wasteful number, since it uses less digits than its factorization.

1636005615645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69426812.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 1636005615645 in words is "one trillion, six hundred thirty-six billion, five million, six hundred fifteen thousand, six hundred forty-five".