214778237761 has 2 divisors, whose sum is σ = 214778237762. Its totient is φ = 214778237760.

The previous prime is 214778237759. The next prime is 214778237771. The reversal of 214778237761 is 167732877412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213310964736 + 1467273025 = 461856^2 + 38305^2 .

It is a cyclic number.

It is not a de Polignac number, because 214778237761 - 2¹ = 214778237759 is a prime.

It is a super-2 number, since 2×214778237761² (a number of 23 digits) contains 22 as substring.

Together with 214778237759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (214778237771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107389118880 + 107389118881.

It is an arithmetic number, because the mean of its divisors is an integer number (107389118881).

Almost surely, 2^214778237761 is an apocalyptic number.

It is an amenable number.

214778237761 is a deficient number, since it is larger than the sum of its proper divisors (1).

214778237761 is an equidigital number, since it uses as much as digits as its factorization.

214778237761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5531904, while the sum is 55.

The spelling of 214778237761 in words is "two hundred fourteen billion, seven hundred seventy-eight million, two hundred thirty-seven thousand, seven hundred sixty-one".