645063551266 has 8 divisors (see below), whose sum is σ = 982037048400. Its totient is φ = 317717868468.

The previous prime is 645063551261. The next prime is 645063551281. The reversal of 645063551266 is 662155360546.

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

It is a super-2 number, since 2×645063551266² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645063551261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2406953416 + ... + 2406953683.

It is an arithmetic number, because the mean of its divisors is an integer number (122754631050).

Almost surely, 2^645063551266 is an apocalyptic number.

645063551266 is a deficient number, since it is larger than the sum of its proper divisors (336973497134).

645063551266 is a wasteful number, since it uses less digits than its factorization.

645063551266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4813907168.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 645063551266 in words is "six hundred forty-five billion, sixty-three million, five hundred fifty-one thousand, two hundred sixty-six".