6420155655 has 16 divisors (see below), whose sum is σ = 10876499424. Its totient is φ = 3222666240.

The previous prime is 6420155653. The next prime is 6420155779. The reversal of 6420155655 is 5565510246.

It is a happy number.

It is not a de Polignac number, because 6420155655 - 2¹ = 6420155653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420155653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12588286 + ... + 12588795.

It is an arithmetic number, because the mean of its divisors is an integer number (679781214).

Almost surely, 2^6420155655 is an apocalyptic number.

6420155655 is a deficient number, since it is larger than the sum of its proper divisors (4456343769).

6420155655 is a wasteful number, since it uses less digits than its factorization.

6420155655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25177106.

The product of its (nonzero) digits is 180000, while the sum is 39.

The square root of 6420155655 is about 80125.8738173881. The cubic root of 6420155655 is about 1858.5825381086.

The spelling of 6420155655 in words is "six billion, four hundred twenty million, one hundred fifty-five thousand, six hundred fifty-five".