617945640623 has 4 divisors (see below), whose sum is σ = 618006275328. Its totient is φ = 617885005920.

The previous prime is 617945640601. The next prime is 617945640737. The reversal of 617945640623 is 326046549716.

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

It is a cyclic number.

It is not a de Polignac number, because 617945640623 - 2¹² = 617945636527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617945640023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30302063 + ... + 30322448.

It is an arithmetic number, because the mean of its divisors is an integer number (154501568832).

Almost surely, 2^617945640623 is an apocalyptic number.

617945640623 is a deficient number, since it is larger than the sum of its proper divisors (60634705).

617945640623 is a wasteful number, since it uses less digits than its factorization.

617945640623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60634704.

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 617945640623 in words is "six hundred seventeen billion, nine hundred forty-five million, six hundred forty thousand, six hundred twenty-three".