673661661487 has 2 divisors, whose sum is σ = 673661661488. Its totient is φ = 673661661486.

The previous prime is 673661661479. The next prime is 673661661493. The reversal of 673661661487 is 784166166376.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 673661661487 - 2³ = 673661661479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673661661187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336830830743 + 336830830744.

It is an arithmetic number, because the mean of its divisors is an integer number (336830830744).

Almost surely, 2^673661661487 is an apocalyptic number.

673661661487 is a deficient number, since it is larger than the sum of its proper divisors (1).

673661661487 is an equidigital number, since it uses as much as digits as its factorization.

673661661487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 61.

The spelling of 673661661487 in words is "six hundred seventy-three billion, six hundred sixty-one million, six hundred sixty-one thousand, four hundred eighty-seven".