620604752557 has 4 divisors (see below), whose sum is σ = 640624260736. Its totient is φ = 600585244380.

The previous prime is 620604752533. The next prime is 620604752561. The reversal of 620604752557 is 755257406026.

620604752557 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 620604752557 - 2¹⁵ = 620604719789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620604752557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620604752587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10009754043 + ... + 10009754104.

It is an arithmetic number, because the mean of its divisors is an integer number (160156065184).

Almost surely, 2^620604752557 is an apocalyptic number.

It is an amenable number.

620604752557 is a deficient number, since it is larger than the sum of its proper divisors (20019508179).

620604752557 is a wasteful number, since it uses less digits than its factorization.

620604752557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20019508178.

The product of its (nonzero) digits is 3528000, while the sum is 49.

The spelling of 620604752557 in words is "six hundred twenty billion, six hundred four million, seven hundred fifty-two thousand, five hundred fifty-seven".