645007426718 has 4 divisors (see below), whose sum is σ = 967511140080. Its totient is φ = 322503713358.

The previous prime is 645007426711. The next prime is 645007426747. The reversal of 645007426718 is 817624700546.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×645007426718² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645007426711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161251856678 + ... + 161251856681.

It is an arithmetic number, because the mean of its divisors is an integer number (241877785020).

Almost surely, 2^645007426718 is an apocalyptic number.

645007426718 is a deficient number, since it is larger than the sum of its proper divisors (322503713362).

645007426718 is a wasteful number, since it uses less digits than its factorization.

645007426718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322503713361.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 645007426718 in words is "six hundred forty-five billion, seven million, four hundred twenty-six thousand, seven hundred eighteen".