645420724202 has 16 divisors (see below), whose sum is σ = 970214784000. Its totient is φ = 322016333328.

The previous prime is 645420724187. The next prime is 645420724217. The reversal of 645420724202 is 202427024546.

645420724202 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645420724187) and next prime (645420724217).

It is a super-2 number, since 2×645420724202² (a number of 24 digits) contains 22 as substring.

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, 2293808 + ... + 2559764.

It is an arithmetic number, because the mean of its divisors is an integer number (60638424000).

Almost surely, 2^645420724202 is an apocalyptic number.

645420724202 is a deficient number, since it is larger than the sum of its proper divisors (324794059798).

645420724202 is a wasteful number, since it uses less digits than its factorization.

645420724202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268565.

The product of its (nonzero) digits is 215040, while the sum is 38.

Adding to 645420724202 its reverse (202427024546), we get a palindrome (847847748748).

The spelling of 645420724202 in words is "six hundred forty-five billion, four hundred twenty million, seven hundred twenty-four thousand, two hundred two".