645304747234122 has 256 divisors, whose sum is σ = 1538971641446400. Its totient is φ = 199931579527680.

The previous prime is 645304747234019. The next prime is 645304747234201. The reversal of 645304747234122 is 221432747403546.

645304747234122 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 0 + 47 + 472 + 3 + 4 + 122 = 666.

It is a super-2 number, since 2×645304747234122² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14412787728 + ... + 14412832500.

It is an arithmetic number, because the mean of its divisors is an integer number (6011607974400).

Almost surely, 2^{645304747234122} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645304747234122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (769485820723200).

645304747234122 is an abundant number, since it is smaller than the sum of its proper divisors (893666894212278).

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

645304747234122 is a wasteful number, since it uses less digits than its factorization.

645304747234122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45970 (or 45964 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 54.

The spelling of 645304747234122 in words is "six hundred forty-five trillion, three hundred four billion, seven hundred forty-seven million, two hundred thirty-four thousand, one hundred twenty-two".