220487291881 has 2 divisors, whose sum is σ = 220487291882. Its totient is φ = 220487291880.

The previous prime is 220487291873. The next prime is 220487291923. The reversal of 220487291881 is 188192784022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208319216400 + 12168075481 = 456420^2 + 110309^2 .

It is a cyclic number.

It is not a de Polignac number, because 220487291881 - 2³ = 220487291873 is a prime.

It is a super-2 number, since 2×220487291881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (220487291851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110243645940 + 110243645941.

It is an arithmetic number, because the mean of its divisors is an integer number (110243645941).

Almost surely, 2^220487291881 is an apocalyptic number.

It is an amenable number.

220487291881 is a deficient number, since it is larger than the sum of its proper divisors (1).

220487291881 is an equidigital number, since it uses as much as digits as its factorization.

220487291881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 220487291881 in words is "two hundred twenty billion, four hundred eighty-seven million, two hundred ninety-one thousand, eight hundred eighty-one".