180511720137997 has 2 divisors, whose sum is σ = 180511720137998. Its totient is φ = 180511720137996.

The previous prime is 180511720137919. The next prime is 180511720138021. The reversal of 180511720137997 is 799731027115081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177764062486761 + 2747657651236 = 13332819^2 + 1657606^2 .

It is a cyclic number.

It is not a de Polignac number, because 180511720137997 - 2¹⁵ = 180511720105229 is a prime.

It is a super-2 number, since 2×180511720137997² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180511720137797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90255860068998 + 90255860068999.

It is an arithmetic number, because the mean of its divisors is an integer number (90255860068999).

Almost surely, 2^{180511720137997} is an apocalyptic number.

It is an amenable number.

180511720137997 is a deficient number, since it is larger than the sum of its proper divisors (1).

180511720137997 is an equidigital number, since it uses as much as digits as its factorization.

180511720137997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6667920, while the sum is 61.

The spelling of 180511720137997 in words is "one hundred eighty trillion, five hundred eleven billion, seven hundred twenty million, one hundred thirty-seven thousand, nine hundred ninety-seven".