61020081081 has 8 divisors (see below), whose sum is σ = 90400120160. Its totient is φ = 40680054036.

The previous prime is 61020081077. The next prime is 61020081091. The reversal of 61020081081 is 18018002016.

61020081081 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 61020081081 - 2² = 61020081077 is a prime.

It is a super-2 number, since 2×61020081081² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2260003003 = 61020081081 / (6 + 1 + 0 + 2 + 0 + 0 + 8 + 1 + 0 + 8 + 1).

It is a Duffinian number.

61020081081 is a modest number, since divided by 81081 gives 61020 as remainder.

It is not an unprimeable number, because it can be changed into a prime (61020081091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1130001475 + ... + 1130001528.

It is an arithmetic number, because the mean of its divisors is an integer number (11300015020).

Almost surely, 2^61020081081 is an apocalyptic number.

It is an amenable number.

61020081081 is a deficient number, since it is larger than the sum of its proper divisors (29380039079).

61020081081 is a wasteful number, since it uses less digits than its factorization.

61020081081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260003012 (or 2260003006 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

Adding to 61020081081 its reverse (18018002016), we get a palindrome (79038083097).

The spelling of 61020081081 in words is "sixty-one billion, twenty million, eighty-one thousand, eighty-one".