61699082449 has 9 divisors (see below), whose sum is σ = 62180950377. Its totient is φ = 61220925924.

The previous prime is 61699082441. The next prime is 61699082477. The reversal of 61699082449 is 94428099616.

The square root of 61699082449 is 248393.

It is a perfect power (a square), and thus also a powerful number.

61699082449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61699082449 - 2³ = 61699082441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61699082393 and 61699082402.

It is not an unprimeable number, because it can be changed into a prime (61699082441) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 34525734 + ... + 34527520.

Almost surely, 2^61699082449 is an apocalyptic number.

61699082449 is the 248393-rd square number.

61699082449 is the 124197-th centered octagonal number.

It is an amenable number.

61699082449 is a deficient number, since it is larger than the sum of its proper divisors (481867928).

61699082449 is an frugal number, since it uses more digits than its factorization.

61699082449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852 (or 1926 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 58.

The spelling of 61699082449 in words is "sixty-one billion, six hundred ninety-nine million, eighty-two thousand, four hundred forty-nine".