61812053321 has 8 divisors (see below), whose sum is σ = 63049851144. Its totient is φ = 60576904960.

The previous prime is 61812053291. The next prime is 61812053333. The reversal of 61812053321 is 12335021816.

It can be written as a sum of positive squares in 4 ways, for example, as 8236470025 + 53575583296 = 90755^2 + 231464^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61812053321 - 2¹⁰ = 61812052297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61812053341) 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, 615206 + ... + 708591.

It is an arithmetic number, because the mean of its divisors is an integer number (7881231393).

Almost surely, 2^61812053321 is an apocalyptic number.

It is an amenable number.

61812053321 is a deficient number, since it is larger than the sum of its proper divisors (1237797823).

61812053321 is a wasteful number, since it uses less digits than its factorization.

61812053321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324731.

The product of its (nonzero) digits is 8640, while the sum is 32.

It can be divided in two parts, 6181 and 2053321, that added together give a palindrome (2059502).

The spelling of 61812053321 in words is "sixty-one billion, eight hundred twelve million, fifty-three thousand, three hundred twenty-one".