1047665664 has 220 divisors, whose sum is σ = 3317024304. Its totient is φ = 328237056.

The previous prime is 1047665653. The next prime is 1047665701. The reversal of 1047665664 is 4665667401.

1047665664 is a `hidden beast` number, since 10 + 4 + 76 + 6 + 566 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1409677 + ... + 1410419.

Almost surely, 2^1047665664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1047665664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1658512152).

1047665664 is an abundant number, since it is smaller than the sum of its proper divisors (2269358640).

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

1047665664 is an equidigital number, since it uses as much as digits as its factorization.

1047665664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 765 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 1047665664 is about 32367.6638638009. The cubic root of 1047665664 is about 1015.6425882354.

The spelling of 1047665664 in words is "one billion, forty-seven million, six hundred sixty-five thousand, six hundred sixty-four".