1564495816 has 16 divisors (see below), whose sum is σ = 3159078300. Its totient is φ = 722074944.

The previous prime is 1564495813. The next prime is 1564495837. The reversal of 1564495816 is 6185944651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1520220100 + 44275716 = 38990^2 + 6654^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1564495816.

It is not an unprimeable number, because it can be changed into a prime (1564495813) 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, 7521511 + ... + 7521718.

Almost surely, 2^1564495816 is an apocalyptic number.

It is an amenable number.

1564495816 is an abundant number, since it is smaller than the sum of its proper divisors (1594582484).

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

1564495816 is a wasteful number, since it uses less digits than its factorization.

1564495816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15043248 (or 15043244 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 49.

The square root of 1564495816 is about 39553.7079930567. The cubic root of 1564495816 is about 1160.8910652452.

The spelling of 1564495816 in words is "one billion, five hundred sixty-four million, four hundred ninety-five thousand, eight hundred sixteen".