61876396321 has 4 divisors (see below), whose sum is σ = 62514297412. Its totient is φ = 61238495232.

The previous prime is 61876396297. The next prime is 61876396367. The reversal of 61876396321 is 12369367816.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31238795025 + 30637601296 = 176745^2 + 175036^2 .

It is a cyclic number.

It is not a de Polignac number, because 61876396321 - 2⁷ = 61876396193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61876396121) 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, 318950400 + ... + 318950593.

It is an arithmetic number, because the mean of its divisors is an integer number (15628574353).

Almost surely, 2^61876396321 is an apocalyptic number.

It is an amenable number.

61876396321 is a deficient number, since it is larger than the sum of its proper divisors (637901091).

61876396321 is an equidigital number, since it uses as much as digits as its factorization.

61876396321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637901090.

The product of its digits is 1959552, while the sum is 52.

The spelling of 61876396321 in words is "sixty-one billion, eight hundred seventy-six million, three hundred ninety-six thousand, three hundred twenty-one".