61680619249 has 4 divisors (see below), whose sum is σ = 61681117680. Its totient is φ = 61680120820.

The previous prime is 61680619243. The next prime is 61680619271. The reversal of 61680619249 is 94291608616.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61680619249 - 2⁹ = 61680618737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61680619196 and 61680619205.

It is not an unprimeable number, because it can be changed into a prime (61680619243) 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, 93594 + ... + 363484.

It is an arithmetic number, because the mean of its divisors is an integer number (15420279420).

Almost surely, 2^61680619249 is an apocalyptic number.

It is an amenable number.

61680619249 is a deficient number, since it is larger than the sum of its proper divisors (498431).

61680619249 is a wasteful number, since it uses less digits than its factorization.

61680619249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498430.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 61680619249 in words is "sixty-one billion, six hundred eighty million, six hundred nineteen thousand, two hundred forty-nine".