671525811461 has 2 divisors, whose sum is σ = 671525811462. Its totient is φ = 671525811460.

The previous prime is 671525811443. The next prime is 671525811469. The reversal of 671525811461 is 164118525176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538095602500 + 133430208961 = 733550^2 + 365281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671525811461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671525811469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335762905730 + 335762905731.

It is an arithmetic number, because the mean of its divisors is an integer number (335762905731).

Almost surely, 2^671525811461 is an apocalyptic number.

It is an amenable number.

671525811461 is a deficient number, since it is larger than the sum of its proper divisors (1).

671525811461 is an equidigital number, since it uses as much as digits as its factorization.

671525811461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 47.

The spelling of 671525811461 in words is "six hundred seventy-one billion, five hundred twenty-five million, eight hundred eleven thousand, four hundred sixty-one".