1635664104 has 48 divisors (see below), whose sum is σ = 4594000320. Its totient is φ = 545220720.

The previous prime is 1635664103. The next prime is 1635664117. The reversal of 1635664104 is 4014665361.

It is a happy number.

1635664104 is a `hidden beast` number, since 1 + 6 + 3 + 5 + 6 + 641 + 0 + 4 = 666.

It is a super-2 number, since 2×1635664104² = 5350794122228245632, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1635664103) 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, 418752 + ... + 422639.

It is an arithmetic number, because the mean of its divisors is an integer number (95708340).

Almost surely, 2^1635664104 is an apocalyptic number.

It is an amenable number.

1635664104 is an abundant number, since it is smaller than the sum of its proper divisors (2958336216).

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

1635664104 is an equidigital number, since it uses as much as digits as its factorization.

1635664104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841412 (or 841396 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1635664104 is about 40443.3443720966. The cubic root of 1635664104 is about 1178.2335208091.

The spelling of 1635664104 in words is "one billion, six hundred thirty-five million, six hundred sixty-four thousand, one hundred four".