645106121342 has 16 divisors (see below), whose sum is σ = 999240278400. Its totient is φ = 312033659520.

The previous prime is 645106121321. The next prime is 645106121353. The reversal of 645106121342 is 243121601546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1737167 + ... + 2075562.

It is an arithmetic number, because the mean of its divisors is an integer number (62452517400).

Almost surely, 2^645106121342 is an apocalyptic number.

645106121342 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

645106121342 is a deficient number, since it is larger than the sum of its proper divisors (354134157058).

645106121342 is a wasteful number, since it uses less digits than its factorization.

645106121342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815491.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 645106121342 its reverse (243121601546), we get a palindrome (888227722888).

The spelling of 645106121342 in words is "six hundred forty-five billion, one hundred six million, one hundred twenty-one thousand, three hundred forty-two".