172245677881 has 2 divisors, whose sum is σ = 172245677882. Its totient is φ = 172245677880.

The previous prime is 172245677861. The next prime is 172245677887. The reversal of 172245677881 is 188776542271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169566062656 + 2679615225 = 411784^2 + 51765^2 .

It is an emirp because it is prime and its reverse (188776542271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172245677881 - 2¹⁵ = 172245645113 is a prime.

It is a super-2 number, since 2×172245677881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172245677887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86122838940 + 86122838941.

It is an arithmetic number, because the mean of its divisors is an integer number (86122838941).

Almost surely, 2^172245677881 is an apocalyptic number.

It is an amenable number.

172245677881 is a deficient number, since it is larger than the sum of its proper divisors (1).

172245677881 is an equidigital number, since it uses as much as digits as its factorization.

172245677881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10536960, while the sum is 58.

The spelling of 172245677881 in words is "one hundred seventy-two billion, two hundred forty-five million, six hundred seventy-seven thousand, eight hundred eighty-one".