216495898261 has 4 divisors (see below), whose sum is σ = 216504741024. Its totient is φ = 216487055500.

The previous prime is 216495898249. The next prime is 216495898303. The reversal of 216495898261 is 162898594612.

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 a de Polignac number, because none of the positive numbers 2^k-216495898261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216495898261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216495898561) 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, 4384555 + ... + 4433656.

It is an arithmetic number, because the mean of its divisors is an integer number (54126185256).

Almost surely, 2^216495898261 is an apocalyptic number.

It is an amenable number.

216495898261 is a deficient number, since it is larger than the sum of its proper divisors (8842763).

216495898261 is an equidigital number, since it uses as much as digits as its factorization.

216495898261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8842762.

The product of its digits is 14929920, while the sum is 61.

The spelling of 216495898261 in words is "two hundred sixteen billion, four hundred ninety-five million, eight hundred ninety-eight thousand, two hundred sixty-one".