1645550136 has 48 divisors (see below), whose sum is σ = 4577157000. Its totient is φ = 533691072.

The previous prime is 1645550131. The next prime is 1645550143. The reversal of 1645550136 is 6310555461.

1645550136 is a `hidden beast` number, since 1 + 645 + 5 + 5 + 0 + 1 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1645550136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645550131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306186 + ... + 311513.

Almost surely, 2^1645550136 is an apocalyptic number.

It is an amenable number.

1645550136 is an abundant number, since it is smaller than the sum of its proper divisors (2931606864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645550136 is a wasteful number, since it uses less digits than its factorization.

1645550136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617748 (or 617741 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 1645550136 is about 40565.3810040039. The cubic root of 1645550136 is about 1180.6025209829.

The spelling of 1645550136 in words is "one billion, six hundred forty-five million, five hundred fifty thousand, one hundred thirty-six".