61823838081 has 4 divisors (see below), whose sum is σ = 82431784112. Its totient is φ = 41215892052.

The previous prime is 61823838071. The next prime is 61823838101. The reversal of 61823838081 is 18083832816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61823838081 - 2³⁵ = 27464099713 is a prime.

It is a super-2 number, since 2×61823838081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61823838081.

It is not an unprimeable number, because it can be changed into a prime (61823838071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10303973011 + ... + 10303973016.

It is an arithmetic number, because the mean of its divisors is an integer number (20607946028).

Almost surely, 2^61823838081 is an apocalyptic number.

It is an amenable number.

61823838081 is a deficient number, since it is larger than the sum of its proper divisors (20607946031).

61823838081 is a wasteful number, since it uses less digits than its factorization.

61823838081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20607946030.

The product of its (nonzero) digits is 442368, while the sum is 48.

The spelling of 61823838081 in words is "sixty-one billion, eight hundred twenty-three million, eight hundred thirty-eight thousand, eighty-one".