527991337721 has 2 divisors, whose sum is σ = 527991337722. Its totient is φ = 527991337720.

The previous prime is 527991337663. The next prime is 527991337739. The reversal of 527991337721 is 127733199725.

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., 271691137600 + 256300200121 = 521240^2 + 506261^2 .

It is a cyclic number.

It is not a de Polignac number, because 527991337721 - 2²² = 527987143417 is a prime.

It is a super-2 number, since 2×527991337721² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (527991337751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263995668860 + 263995668861.

It is an arithmetic number, because the mean of its divisors is an integer number (263995668861).

Almost surely, 2^527991337721 is an apocalyptic number.

It is an amenable number.

527991337721 is a deficient number, since it is larger than the sum of its proper divisors (1).

527991337721 is an equidigital number, since it uses as much as digits as its factorization.

527991337721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5000940, while the sum is 56.

The spelling of 527991337721 in words is "five hundred twenty-seven billion, nine hundred ninety-one million, three hundred thirty-seven thousand, seven hundred twenty-one".