645100026505 has 16 divisors (see below), whose sum is σ = 844678856448. Its totient is φ = 469061280000.

The previous prime is 645100026481. The next prime is 645100026539. The reversal of 645100026505 is 505620001546.

645100026505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645100026505 - 2¹³ = 645100018313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1024896 + ... + 1529905.

It is an arithmetic number, because the mean of its divisors is an integer number (52792428528).

Almost surely, 2^645100026505 is an apocalyptic number.

It is an amenable number.

645100026505 is a deficient number, since it is larger than the sum of its proper divisors (199578829943).

645100026505 is a wasteful number, since it uses less digits than its factorization.

645100026505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559408.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 645100026505 in words is "six hundred forty-five billion, one hundred million, twenty-six thousand, five hundred five".