2161503663 has 32 divisors (see below), whose sum is σ = 3195735552. Its totient is φ = 1288627200.

The previous prime is 2161503649. The next prime is 2161503691. The reversal of 2161503663 is 3663051612.

It is not a de Polignac number, because 2161503663 - 2¹² = 2161499567 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161503263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 508758 + ... + 512988.

It is an arithmetic number, because the mean of its divisors is an integer number (99866736).

Almost surely, 2^2161503663 is an apocalyptic number.

2161503663 is a deficient number, since it is larger than the sum of its proper divisors (1034231889).

2161503663 is a wasteful number, since it uses less digits than its factorization.

2161503663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 2161503663 is about 46491.9741783461. The cubic root of 2161503663 is about 1292.9607021945.

The spelling of 2161503663 in words is "two billion, one hundred sixty-one million, five hundred three thousand, six hundred sixty-three".