652181237261 has 2 divisors, whose sum is σ = 652181237262. Its totient is φ = 652181237260.

The previous prime is 652181237207. The next prime is 652181237321. The reversal of 652181237261 is 162732181256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 572731104100 + 79450133161 = 756790^2 + 281869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-652181237261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (652181227261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326090618630 + 326090618631.

It is an arithmetic number, because the mean of its divisors is an integer number (326090618631).

Almost surely, 2^652181237261 is an apocalyptic number.

It is an amenable number.

652181237261 is a deficient number, since it is larger than the sum of its proper divisors (1).

652181237261 is an equidigital number, since it uses as much as digits as its factorization.

652181237261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The spelling of 652181237261 in words is "six hundred fifty-two billion, one hundred eighty-one million, two hundred thirty-seven thousand, two hundred sixty-one".