645606620342 has 4 divisors (see below), whose sum is σ = 968409930516. Its totient is φ = 322803310170.

The previous prime is 645606620273. The next prime is 645606620389. The reversal of 645606620342 is 243026606546.

645606620342 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.

It is a junction number, because it is equal to n+sod(n) for n = 645606620293 and 645606620302.

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, 161401655084 + ... + 161401655087.

It is an arithmetic number, because the mean of its divisors is an integer number (242102482629).

Almost surely, 2^645606620342 is an apocalyptic number.

645606620342 is a deficient number, since it is larger than the sum of its proper divisors (322803310174).

645606620342 is a wasteful number, since it uses less digits than its factorization.

645606620342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322803310173.

The product of its (nonzero) digits is 1244160, while the sum is 44.

The spelling of 645606620342 in words is "six hundred forty-five billion, six hundred six million, six hundred twenty thousand, three hundred forty-two".