61664355255 has 16 divisors (see below), whose sum is σ = 104466672864. Its totient is φ = 30953088000.

The previous prime is 61664355251. The next prime is 61664355341. The reversal of 61664355255 is 55255346616.

It is not a de Polignac number, because 61664355255 - 2² = 61664355251 is a prime.

It is a super-2 number, since 2×61664355255² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61664355251) 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, 120910246 + ... + 120910755.

It is an arithmetic number, because the mean of its divisors is an integer number (6529167054).

Almost surely, 2^61664355255 is an apocalyptic number.

61664355255 is a deficient number, since it is larger than the sum of its proper divisors (42802317609).

61664355255 is a wasteful number, since it uses less digits than its factorization.

61664355255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241821026.

The product of its digits is 3240000, while the sum is 48.

The spelling of 61664355255 in words is "sixty-one billion, six hundred sixty-four million, three hundred fifty-five thousand, two hundred fifty-five".