645113000842 has 4 divisors (see below), whose sum is σ = 967669501266. Its totient is φ = 322556500420.

The previous prime is 645113000747. The next prime is 645113000923. The reversal of 645113000842 is 248000311546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 644582573881 + 530426961 = 802859^2 + 23031^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645113000798 and 645113000807.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161278250209 + ... + 161278250212.

Almost surely, 2^645113000842 is an apocalyptic number.

645113000842 is a deficient number, since it is larger than the sum of its proper divisors (322556500424).

645113000842 is a wasteful number, since it uses less digits than its factorization.

645113000842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322556500423.

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 645113000842 in words is "six hundred forty-five billion, one hundred thirteen million, eight hundred forty-two", and thus it is an aban number.