1247965889955 has 32 divisors (see below), whose sum is σ = 2000272834560. Its totient is φ = 664407048960.

The previous prime is 1247965889867. The next prime is 1247965890013. The reversal of 1247965889955 is 5599885697421.

It is not a de Polignac number, because 1247965889955 - 2²⁰ = 1247964841379 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19786620 + ... + 19849590.

It is an arithmetic number, because the mean of its divisors is an integer number (62508526080).

Almost surely, 2^{1247965889955} is an apocalyptic number.

1247965889955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1247965889955 is a deficient number, since it is larger than the sum of its proper divisors (752306944605).

1247965889955 is a wasteful number, since it uses less digits than its factorization.

1247965889955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65291.

The product of its digits is 1959552000, while the sum is 78.

The spelling of 1247965889955 in words is "one trillion, two hundred forty-seven billion, nine hundred sixty-five million, eight hundred eighty-nine thousand, nine hundred fifty-five".