1636682945 has 8 divisors (see below), whose sum is σ = 1965689640. Its totient is φ = 1308232960.

The previous prime is 1636682911. The next prime is 1636682959. The reversal of 1636682945 is 5492866361.

It can be written as a sum of positive squares in 4 ways, for example, as 478778161 + 1157904784 = 21881^2 + 34028^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1636682945 - 2⁸ = 1636682689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1636682893 and 1636682902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132680 + ... + 144489.

It is an arithmetic number, because the mean of its divisors is an integer number (245711205).

Almost surely, 2^1636682945 is an apocalyptic number.

It is an amenable number.

1636682945 is a deficient number, since it is larger than the sum of its proper divisors (329006695).

1636682945 is a wasteful number, since it uses less digits than its factorization.

1636682945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278355.

The product of its digits is 1866240, while the sum is 50.

The square root of 1636682945 is about 40455.9383156540. The cubic root of 1636682945 is about 1178.4781071834.

The spelling of 1636682945 in words is "one billion, six hundred thirty-six million, six hundred eighty-two thousand, nine hundred forty-five".