1634664361 has 4 divisors (see below), whose sum is σ = 1783270224. Its totient is φ = 1486058500.

The previous prime is 1634664341. The next prime is 1634664407.

1634664361 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1634664361 - 2⁷ = 1634664233 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1634664331) 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, 74302915 + ... + 74302936.

It is an arithmetic number, because the mean of its divisors is an integer number (445817556).

Almost surely, 2^1634664361 is an apocalyptic number.

1634664361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1634664361 is a deficient number, since it is larger than the sum of its proper divisors (148605863).

1634664361 is a wasteful number, since it uses less digits than its factorization.

1634664361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148605862.

The product of its digits is 186624, while the sum is 40.

The square root of 1634664361 is about 40430.9826865487. The cubic root of 1634664361 is about 1177.9934204154.

The spelling of 1634664361 in words is "one billion, six hundred thirty-four million, six hundred sixty-four thousand, three hundred sixty-one".