61173120587 has 2 divisors, whose sum is σ = 61173120588. Its totient is φ = 61173120586.

The previous prime is 61173120563. The next prime is 61173120629. The reversal of 61173120587 is 78502137116.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61173120587 - 2¹⁸ = 61172858443 is a prime.

It is not a weakly prime, because it can be changed into another prime (61173122587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30586560293 + 30586560294.

It is an arithmetic number, because the mean of its divisors is an integer number (30586560294).

Almost surely, 2^61173120587 is an apocalyptic number.

61173120587 is a deficient number, since it is larger than the sum of its proper divisors (1).

61173120587 is an equidigital number, since it uses as much as digits as its factorization.

61173120587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 61173120587 in words is "sixty-one billion, one hundred seventy-three million, one hundred twenty thousand, five hundred eighty-seven".