507305081561 has 2 divisors, whose sum is σ = 507305081562. Its totient is φ = 507305081560.

The previous prime is 507305081501. The next prime is 507305081573. The reversal of 507305081561 is 165180503705.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 460320183961 + 46984897600 = 678469^2 + 216760^2 .

It is a cyclic number.

It is not a de Polignac number, because 507305081561 - 2¹⁰ = 507305080537 is a prime.

It is a super-2 number, since 2×507305081561² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (507305081501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253652540780 + 253652540781.

It is an arithmetic number, because the mean of its divisors is an integer number (253652540781).

Almost surely, 2^507305081561 is an apocalyptic number.

It is an amenable number.

507305081561 is a deficient number, since it is larger than the sum of its proper divisors (1).

507305081561 is an equidigital number, since it uses as much as digits as its factorization.

507305081561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 507305081561 in words is "five hundred seven billion, three hundred five million, eighty-one thousand, five hundred sixty-one".