645187368040071 has 16 divisors (see below), whose sum is σ = 868768378543488. Its totient is φ = 425865646836000.

The previous prime is 645187368040049. The next prime is 645187368040073. The reversal of 645187368040071 is 170040863781546.

It is not a de Polignac number, because 645187368040071 - 2⁷ = 645187368039943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645187368039987 and 645187368040014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645187368040073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341852220 + ... + 343734366.

It is an arithmetic number, because the mean of its divisors is an integer number (54298023658968).

Almost surely, 2^{645187368040071} is an apocalyptic number.

645187368040071 is a deficient number, since it is larger than the sum of its proper divisors (223581010503417).

645187368040071 is a wasteful number, since it uses less digits than its factorization.

645187368040071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013582.

The product of its (nonzero) digits is 27095040, while the sum is 60.

The spelling of 645187368040071 in words is "six hundred forty-five trillion, one hundred eighty-seven billion, three hundred sixty-eight million, forty thousand, seventy-one".