645623011242 has 96 divisors (see below), whose sum is σ = 1548048692736. Its totient is φ = 192836304000.

The previous prime is 645623011207. The next prime is 645623011321. The reversal of 645623011242 is 242110326546.

645623011242 is a `hidden beast` number, since 6 + 4 + 5 + 623 + 0 + 1 + 1 + 24 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 645623011197 and 645623011206.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4387168 + ... + 4531940.

It is an arithmetic number, because the mean of its divisors is an integer number (16125507216).

Almost surely, 2^645623011242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645623011242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774024346368).

645623011242 is an abundant number, since it is smaller than the sum of its proper divisors (902425681494).

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

645623011242 is a wasteful number, since it uses less digits than its factorization.

645623011242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145116 (or 145113 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 645623011242 its reverse (242110326546), we get a palindrome (887733337788).

The spelling of 645623011242 in words is "six hundred forty-five billion, six hundred twenty-three million, eleven thousand, two hundred forty-two".