216783294477 has 4 divisors (see below), whose sum is σ = 289044392640. Its totient is φ = 144522196316.

The previous prime is 216783294451. The next prime is 216783294491. The reversal of 216783294477 is 774492387612.

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 216783294477 - 2¹⁶ = 216783228941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216783294477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216783254477) 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, 36130549077 + ... + 36130549082.

It is an arithmetic number, because the mean of its divisors is an integer number (72261098160).

Almost surely, 2^216783294477 is an apocalyptic number.

It is an amenable number.

216783294477 is a deficient number, since it is larger than the sum of its proper divisors (72261098163).

216783294477 is an equidigital number, since it uses as much as digits as its factorization.

216783294477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72261098162.

The product of its digits is 28449792, while the sum is 60.

The spelling of 216783294477 in words is "two hundred sixteen billion, seven hundred eighty-three million, two hundred ninety-four thousand, four hundred seventy-seven".