1650564538 has 32 divisors (see below), whose sum is σ = 2873756160. Its totient is φ = 696384000.

The previous prime is 1650564533. The next prime is 1650564557. The reversal of 1650564538 is 8354650561.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1650564494 and 1650564503.

It is not an unprimeable number, because it can be changed into a prime (1650564533) 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, 410538 + ... + 414538.

It is an arithmetic number, because the mean of its divisors is an integer number (89804880).

Almost surely, 2^1650564538 is an apocalyptic number.

1650564538 is a deficient number, since it is larger than the sum of its proper divisors (1223191622).

1650564538 is a wasteful number, since it uses less digits than its factorization.

1650564538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4462.

The product of its (nonzero) digits is 432000, while the sum is 43.

The square root of 1650564538 is about 40627.1404113063. The cubic root of 1650564538 is about 1181.8005018115.

The spelling of 1650564538 in words is "one billion, six hundred fifty million, five hundred sixty-four thousand, five hundred thirty-eight".