61543019719 has 12 divisors (see below), whose sum is σ = 65236328760. Its totient is φ = 58049233200.

The previous prime is 61543019689. The next prime is 61543019773. The reversal of 61543019719 is 91791034516.

It is not a de Polignac number, because 61543019719 - 2⁹ = 61543019207 is a prime.

It is a super-2 number, since 2×61543019719² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61543019119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289557 + ... + 454894.

It is an arithmetic number, because the mean of its divisors is an integer number (5436360730).

Almost surely, 2^61543019719 is an apocalyptic number.

61543019719 is a deficient number, since it is larger than the sum of its proper divisors (3693309041).

61543019719 is a wasteful number, since it uses less digits than its factorization.

61543019719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744718 (or 744699 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 61543019719 in words is "sixty-one billion, five hundred forty-three million, nineteen thousand, seven hundred nineteen".