1645217969746 has 16 divisors (see below), whose sum is σ = 2664002678400. Its totient is φ = 757519118928.

The previous prime is 1645217969713. The next prime is 1645217969767. The reversal of 1645217969746 is 6479697125461.

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 7 ways as a sum of consecutive naturals, for example, 75499386 + ... + 75521173.

It is an arithmetic number, because the mean of its divisors is an integer number (166500167400).

Almost surely, 2^{1645217969746} is an apocalyptic number.

1645217969746 is a deficient number, since it is larger than the sum of its proper divisors (1018784708654).

1645217969746 is a wasteful number, since it uses less digits than its factorization.

1645217969746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151020993.

The product of its digits is 137168640, while the sum is 67.

The spelling of 1645217969746 in words is "one trillion, six hundred forty-five billion, two hundred seventeen million, nine hundred sixty-nine thousand, seven hundred forty-six".