216748877 has 2 divisors, whose sum is σ = 216748878. Its totient is φ = 216748876.

The previous prime is 216748867. The next prime is 216748879. The reversal of 216748877 is 778847612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151930276 + 64818601 = 12326^2 + 8051^2 .

It is a cyclic number.

It is not a de Polignac number, because 216748877 - 2²⁶ = 149640013 is a prime.

It is a super-2 number, since 2×216748877² = 93960151361522258, which contains 22 as substring.

Together with 216748879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216748879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108374438 + 108374439.

It is an arithmetic number, because the mean of its divisors is an integer number (108374439).

Almost surely, 2^216748877 is an apocalyptic number.

It is an amenable number.

216748877 is a deficient number, since it is larger than the sum of its proper divisors (1).

216748877 is an equidigital number, since it uses as much as digits as its factorization.

216748877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1053696, while the sum is 50.

The square root of 216748877 is about 14722.3937252065. The cubic root of 216748877 is about 600.6926048196.

The spelling of 216748877 in words is "two hundred sixteen million, seven hundred forty-eight thousand, eight hundred seventy-seven".