1247173490845 has 8 divisors (see below), whose sum is σ = 1497875434200. Its totient is φ = 996893962560.

The previous prime is 1247173490777. The next prime is 1247173490873. The reversal of 1247173490845 is 5480943717421.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 109252064089 + 1137921426756 = 330533^2 + 1066734^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1247173490845 - 2³⁹ = 697417676957 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105597270 + ... + 105609079.

It is an arithmetic number, because the mean of its divisors is an integer number (187234429275).

Almost surely, 2^{1247173490845} is an apocalyptic number.

It is an amenable number.

1247173490845 is a deficient number, since it is larger than the sum of its proper divisors (250701943355).

1247173490845 is a wasteful number, since it uses less digits than its factorization.

1247173490845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211207535.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 1247173490845 in words is "one trillion, two hundred forty-seven billion, one hundred seventy-three million, four hundred ninety thousand, eight hundred forty-five".