620473783691 has 2 divisors, whose sum is σ = 620473783692. Its totient is φ = 620473783690.

The previous prime is 620473783663. The next prime is 620473783747. The reversal of 620473783691 is 196387374026.

620473783691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (620473783747) can be obtained adding 620473783691 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 620473783691 - 2⁶ = 620473783627 is a prime.

It is not a weakly prime, because it can be changed into another prime (620473783591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310236891845 + 310236891846.

It is an arithmetic number, because the mean of its divisors is an integer number (310236891846).

Almost surely, 2^620473783691 is an apocalyptic number.

620473783691 is a deficient number, since it is larger than the sum of its proper divisors (1).

620473783691 is an equidigital number, since it uses as much as digits as its factorization.

620473783691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 620473783691 in words is "six hundred twenty billion, four hundred seventy-three million, seven hundred eighty-three thousand, six hundred ninety-one".