1620064739753 has 4 divisors (see below), whose sum is σ = 1620203348820. Its totient is φ = 1619926130688.

The previous prime is 1620064739749. The next prime is 1620064739789. The reversal of 1620064739753 is 3579374600261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1256827092889 + 363237646864 = 1121083^2 + 602692^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620064739753 - 2² = 1620064739749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1620064739695 and 1620064739704.

It is not an unprimeable number, because it can be changed into a prime (1620064736753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69287000 + ... + 69310377.

It is an arithmetic number, because the mean of its divisors is an integer number (405050837205).

Almost surely, 2^{1620064739753} is an apocalyptic number.

It is an amenable number.

1620064739753 is a deficient number, since it is larger than the sum of its proper divisors (138609067).

1620064739753 is a wasteful number, since it uses less digits than its factorization.

1620064739753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138609066.

The product of its (nonzero) digits is 5715360, while the sum is 53.

The spelling of 1620064739753 in words is "one trillion, six hundred twenty billion, sixty-four million, seven hundred thirty-nine thousand, seven hundred fifty-three".