1913997280647 has 8 divisors (see below), whose sum is σ = 2580670491120. Its totient is φ = 1261661128640.

The previous prime is 1913997280631. The next prime is 1913997280691. The reversal of 1913997280647 is 7460827993191.

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

It is a cyclic number.

It is not a de Polignac number, because 1913997280647 - 2⁴ = 1913997280631 is a prime.

It is a super-2 number, since 2×1913997280647² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913997280147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3584264304 + ... + 3584264837.

It is an arithmetic number, because the mean of its divisors is an integer number (322583811390).

Almost surely, 2^{1913997280647} is an apocalyptic number.

1913997280647 is a deficient number, since it is larger than the sum of its proper divisors (666673210473).

1913997280647 is an equidigital number, since it uses as much as digits as its factorization.

1913997280647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7168529233.

The product of its (nonzero) digits is 41150592, while the sum is 66.

The spelling of 1913997280647 in words is "one trillion, nine hundred thirteen billion, nine hundred ninety-seven million, two hundred eighty thousand, six hundred forty-seven".