620143555 has 4 divisors (see below), whose sum is σ = 744172272. Its totient is φ = 496114840.

The previous prime is 620143553. The next prime is 620143591. The reversal of 620143555 is 555341026.

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

It is not a de Polignac number, because 620143555 - 2¹ = 620143553 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620143553) 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, 62014351 + ... + 62014360.

It is an arithmetic number, because the mean of its divisors is an integer number (186043068).

Almost surely, 2^620143555 is an apocalyptic number.

620143555 is a deficient number, since it is larger than the sum of its proper divisors (124028717).

620143555 is a wasteful number, since it uses less digits than its factorization.

620143555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124028716.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 620143555 is about 24902.6816829031. The cubic root of 620143555 is about 852.7677048737.

The spelling of 620143555 in words is "six hundred twenty million, one hundred forty-three thousand, five hundred fifty-five".