2161636763 has 16 divisors (see below), whose sum is σ = 2550483936. Its totient is φ = 1806147840.

The previous prime is 2161636739. The next prime is 2161636781. The reversal of 2161636763 is 3676361612.

It is a cyclic number.

It is not a de Polignac number, because 2161636763 - 2²² = 2157442459 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2161636763.

It is not an unprimeable number, because it can be changed into a prime (2161636723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 881 + ... + 65757.

It is an arithmetic number, because the mean of its divisors is an integer number (159405246).

Almost surely, 2^2161636763 is an apocalyptic number.

2161636763 is a deficient number, since it is larger than the sum of its proper divisors (388847173).

2161636763 is a wasteful number, since it uses less digits than its factorization.

2161636763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65134.

The product of its digits is 163296, while the sum is 41.

The square root of 2161636763 is about 46493.4055861689. The cubic root of 2161636763 is about 1292.9872407473.

The spelling of 2161636763 in words is "two billion, one hundred sixty-one million, six hundred thirty-six thousand, seven hundred sixty-three".