645624432101 has 8 divisors (see below), whose sum is σ = 704371512864. Its totient is φ = 586886343120.

The previous prime is 645624432091. The next prime is 645624432121. The reversal of 645624432101 is 101234426546.

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

It is not a de Polignac number, because 645624432101 - 2³⁸ = 370746525157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645624432121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2097371 + ... + 2385416.

It is an arithmetic number, because the mean of its divisors is an integer number (88046439108).

Almost surely, 2^645624432101 is an apocalyptic number.

It is an amenable number.

645624432101 is a deficient number, since it is larger than the sum of its proper divisors (58747080763).

645624432101 is a wasteful number, since it uses less digits than its factorization.

645624432101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4495891.

The product of its (nonzero) digits is 138240, while the sum is 38.

Adding to 645624432101 its reverse (101234426546), we get a palindrome (746858858647).

The spelling of 645624432101 in words is "six hundred forty-five billion, six hundred twenty-four million, four hundred thirty-two thousand, one hundred one".