61720923347 has 4 divisors (see below), whose sum is σ = 61728590040. Its totient is φ = 61713256656.

The previous prime is 61720923323. The next prime is 61720923349. The reversal of 61720923347 is 74332902716.

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

It is a cyclic number.

It is not a de Polignac number, because 61720923347 - 2⁶ = 61720923283 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61720923298 and 61720923307.

It is not an unprimeable number, because it can be changed into a prime (61720923349) 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, 3821258 + ... + 3837375.

It is an arithmetic number, because the mean of its divisors is an integer number (15432147510).

Almost surely, 2^61720923347 is an apocalyptic number.

61720923347 is a deficient number, since it is larger than the sum of its proper divisors (7666693).

61720923347 is an equidigital number, since it uses as much as digits as its factorization.

61720923347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7666692.

The product of its (nonzero) digits is 381024, while the sum is 44.

The spelling of 61720923347 in words is "sixty-one billion, seven hundred twenty million, nine hundred twenty-three thousand, three hundred forty-seven".