61634739861 has 64 divisors (see below), whose sum is σ = 97744838400. Its totient is φ = 38248962048.

The previous prime is 61634739851. The next prime is 61634739937. The reversal of 61634739861 is 16893743616.

It is a happy number.

61634739861 is a `hidden beast` number, since 6 + 163 + 473 + 9 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 61634739861 - 2¹⁴ = 61634723477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61634739798 and 61634739807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61634739851) 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 63 ways as a sum of consecutive naturals, for example, 54883446 + ... + 54884568.

It is an arithmetic number, because the mean of its divisors is an integer number (1527263100).

Almost surely, 2^61634739861 is an apocalyptic number.

It is an amenable number.

61634739861 is a deficient number, since it is larger than the sum of its proper divisors (36110098539).

61634739861 is a wasteful number, since it uses less digits than its factorization.

61634739861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355 (or 2349 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 61634739861 in words is "sixty-one billion, six hundred thirty-four million, seven hundred thirty-nine thousand, eight hundred sixty-one".