1645706005642 has 8 divisors (see below), whose sum is σ = 2613768361956. Its totient is φ = 774449884992.

The previous prime is 1645706005639. The next prime is 1645706005651. The reversal of 1645706005642 is 2465006075461.

It can be written as a sum of positive squares in 2 ways, for example, as 1597819874401 + 47886131241 = 1264049^2 + 218829^2 .

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

It is a super-2 number, since 2×1645706005642² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1645706005592 and 1645706005601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24201558873 + ... + 24201558940.

Almost surely, 2^{1645706005642} is an apocalyptic number.

1645706005642 is a deficient number, since it is larger than the sum of its proper divisors (968062356314).

1645706005642 is a wasteful number, since it uses less digits than its factorization.

1645706005642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48403117832.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 1645706005642 in words is "one trillion, six hundred forty-five billion, seven hundred six million, five thousand, six hundred forty-two".