620656740647 has 4 divisors (see below), whose sum is σ = 624124096920. Its totient is φ = 617189384376.

The previous prime is 620656740553. The next prime is 620656740689. The reversal of 620656740647 is 746047656026.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746047656026 = 2 ⋅373023828013.

It is a cyclic number.

It is not a de Polignac number, because 620656740647 - 2³⁴ = 603476871463 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 (620656743647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1733677868 + ... + 1733678225.

It is an arithmetic number, because the mean of its divisors is an integer number (156031024230).

Almost surely, 2^620656740647 is an apocalyptic number.

620656740647 is a deficient number, since it is larger than the sum of its proper divisors (3467356273).

620656740647 is a wasteful number, since it uses less digits than its factorization.

620656740647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467356272.

The product of its (nonzero) digits is 10160640, while the sum is 53.

The spelling of 620656740647 in words is "six hundred twenty billion, six hundred fifty-six million, seven hundred forty thousand, six hundred forty-seven".