645260062120 has 16 divisors (see below), whose sum is σ = 1451835139860. Its totient is φ = 258104024832.

The previous prime is 645260062001. The next prime is 645260062121. The reversal of 645260062120 is 21260062546.

It can be written as a sum of positive squares in 2 ways, for example, as 644625928996 + 634133124 = 802886^2 + 25182^2 .

It is not an unprimeable number, because it can be changed into a prime (645260062121) 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, 8065750737 + ... + 8065750816.

Almost surely, 2^645260062120 is an apocalyptic number.

It is an amenable number.

645260062120 is an abundant number, since it is smaller than the sum of its proper divisors (806575077740).

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

645260062120 is a wasteful number, since it uses less digits than its factorization.

645260062120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16131501564 (or 16131501560 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 645260062120 in words is "six hundred forty-five billion, two hundred sixty million, sixty-two thousand, one hundred twenty".