61896109799943 has 20 divisors (see below), whose sum is σ = 92522800631448. Its totient is φ = 41236979176080.

The previous prime is 61896109799941. The next prime is 61896109800011. The reversal of 61896109799943 is 34999790169816.

It is a happy number.

61896109799943 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 61896109799943 - 2¹ = 61896109799941 is a prime.

It is a super-2 number, since 2×61896109799943² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61896109799941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 250746468 + ... + 250993193.

Almost surely, 2^{61896109799943} is an apocalyptic number.

61896109799943 is a deficient number, since it is larger than the sum of its proper divisors (30626690831505).

61896109799943 is a wasteful number, since it uses less digits than its factorization.

61896109799943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501741196 (or 501741187 counting only the distinct ones).

The product of its (nonzero) digits is 1428513408, while the sum is 81.

The spelling of 61896109799943 in words is "sixty-one trillion, eight hundred ninety-six billion, one hundred nine million, seven hundred ninety-nine thousand, nine hundred forty-three".