64155621255 has 128 divisors (see below), whose sum is σ = 119218176000. Its totient is φ = 29135116800.

The previous prime is 64155621197. The next prime is 64155621259. The reversal of 64155621255 is 55212655146.

It is not a de Polignac number, because 64155621255 - 2¹⁰ = 64155620231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64155621259) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 183826821 + ... + 183827169.

It is an arithmetic number, because the mean of its divisors is an integer number (931392000).

Almost surely, 2^64155621255 is an apocalyptic number.

64155621255 is a deficient number, since it is larger than the sum of its proper divisors (55062554745).

64155621255 is a wasteful number, since it uses less digits than its factorization.

64155621255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885.

The product of its digits is 360000, while the sum is 42.

The spelling of 64155621255 in words is "sixty-four billion, one hundred fifty-five million, six hundred twenty-one thousand, two hundred fifty-five".