645473161374546 has 32 divisors (see below), whose sum is σ = 1306519678795968. Its totient is φ = 212571284350400.

The previous prime is 645473161374539. The next prime is 645473161374551.

645473161374546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645473161374546² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1140120885 + ... + 1140686888.

It is an arithmetic number, because the mean of its divisors is an integer number (40828739962374).

Almost surely, 2^{645473161374546} is an apocalyptic number.

645473161374546 is an abundant number, since it is smaller than the sum of its proper divisors (661046517421422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645473161374546 is a wasteful number, since it uses less digits than its factorization.

645473161374546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280808346.

The product of its digits is 609638400, while the sum is 66.

The spelling of 645473161374546 in words is "six hundred forty-five trillion, four hundred seventy-three billion, one hundred sixty-one million, three hundred seventy-four thousand, five hundred forty-six".