61863017749 has 8 divisors (see below), whose sum is σ = 66624922112. Its totient is φ = 57101572080.

The previous prime is 61863017747. The next prime is 61863017759. The reversal of 61863017749 is 94771036816.

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 61863017749 - 2¹ = 61863017747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61863017696 and 61863017705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61863017747) 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, 196792 + ... + 403054.

It is an arithmetic number, because the mean of its divisors is an integer number (8328115264).

Almost surely, 2^61863017749 is an apocalyptic number.

It is an amenable number.

61863017749 is a deficient number, since it is larger than the sum of its proper divisors (4761904363).

61863017749 is a wasteful number, since it uses less digits than its factorization.

61863017749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229347.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 61863017749 in words is "sixty-one billion, eight hundred sixty-three million, seventeen thousand, seven hundred forty-nine".