645622004542 has 16 divisors (see below), whose sum is σ = 995818423392. Its totient is φ = 313703785440.

The previous prime is 645622004513. The next prime is 645622004549. The reversal of 645622004542 is 245400226546.

It is a junction number, because it is equal to n+sod(n) for n = 645622004495 and 645622004504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645622004549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5252658 + ... + 5374165.

It is an arithmetic number, because the mean of its divisors is an integer number (62238651462).

Almost surely, 2^645622004542 is an apocalyptic number.

645622004542 is a deficient number, since it is larger than the sum of its proper divisors (350196418850).

645622004542 is a wasteful number, since it uses less digits than its factorization.

645622004542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10627683.

The product of its (nonzero) digits is 460800, while the sum is 40.

The spelling of 645622004542 in words is "six hundred forty-five billion, six hundred twenty-two million, four thousand, five hundred forty-two".