645302858542 has 4 divisors (see below), whose sum is σ = 967954287816. Its totient is φ = 322651429270.

The previous prime is 645302858537. The next prime is 645302858569. The reversal of 645302858542 is 245858203546.

645302858542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245858203546 = 2 ⋅122929101773.

It is a self number, because there is not a number n which added to its sum of digits gives 645302858542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161325714634 + ... + 161325714637.

It is an arithmetic number, because the mean of its divisors is an integer number (241988571954).

Almost surely, 2^645302858542 is an apocalyptic number.

645302858542 is a deficient number, since it is larger than the sum of its proper divisors (322651429274).

645302858542 is a wasteful number, since it uses less digits than its factorization.

645302858542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322651429273.

The product of its (nonzero) digits is 9216000, while the sum is 52.

The spelling of 645302858542 in words is "six hundred forty-five billion, three hundred two million, eight hundred fifty-eight thousand, five hundred forty-two".