2161637803 has 4 divisors (see below), whose sum is σ = 2327917648. Its totient is φ = 1995357960.

The previous prime is 2161637743. The next prime is 2161637827. The reversal of 2161637803 is 3087361612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161637803 - 2¹⁷ = 2161506731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161637893) 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, 83139903 + ... + 83139928.

It is an arithmetic number, because the mean of its divisors is an integer number (581979412).

Almost surely, 2^2161637803 is an apocalyptic number.

2161637803 is a deficient number, since it is larger than the sum of its proper divisors (166279845).

2161637803 is a wasteful number, since it uses less digits than its factorization.

2161637803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166279844.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 2161637803 is about 46493.4167705494. The cubic root of 2161637803 is about 1292.9874481066.

The spelling of 2161637803 in words is "two billion, one hundred sixty-one million, six hundred thirty-seven thousand, eight hundred three".