61105555511 has 48 divisors (see below), whose sum is σ = 87016473600. Its totient is φ = 41638639680.

The previous prime is 61105555501. The next prime is 61105555519. The reversal of 61105555511 is 11555550116.

61105555511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61105555511 - 2¹⁴ = 61105539127 is a prime.

It is a super-2 number, since 2×61105555511² (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 (61105555519) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63170 + ... + 355248.

It is an arithmetic number, because the mean of its divisors is an integer number (1812843200).

Almost surely, 2^61105555511 is an apocalyptic number.

61105555511 is a deficient number, since it is larger than the sum of its proper divisors (25910918089).

61105555511 is a wasteful number, since it uses less digits than its factorization.

61105555511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292140 (or 292129 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 35.

It can be divided in two parts, 61105 and 555511, that added together give a palindrome (616616).

The spelling of 61105555511 in words is "sixty-one billion, one hundred five million, five hundred fifty-five thousand, five hundred eleven".