1447720239657 has 16 divisors (see below), whose sum is σ = 1970835213312. Its totient is φ = 945048564240.

The previous prime is 1447720239601. The next prime is 1447720239661. The reversal of 1447720239657 is 7569320277441.

It is not a de Polignac number, because 1447720239657 - 2⁷ = 1447720239529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1447720239597 and 1447720239606.

It is not an unprimeable number, because it can be changed into a prime (1447720239157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21531069 + ... + 21598202.

It is an arithmetic number, because the mean of its divisors is an integer number (123177200832).

Almost surely, 2^{1447720239657} is an apocalyptic number.

It is an amenable number.

1447720239657 is a deficient number, since it is larger than the sum of its proper divisors (523114973655).

1447720239657 is a wasteful number, since it uses less digits than its factorization.

1447720239657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43129508.

The product of its (nonzero) digits is 17781120, while the sum is 57.

The spelling of 1447720239657 in words is "one trillion, four hundred forty-seven billion, seven hundred twenty million, two hundred thirty-nine thousand, six hundred fifty-seven".