61539082749 has 64 divisors (see below), whose sum is σ = 93627187200. Its totient is φ = 39938184000.

The previous prime is 61539082727. The next prime is 61539082753. The reversal of 61539082749 is 94728093516.

61539082749 is a `hidden beast` number, since 61 + 539 + 0 + 8 + 2 + 7 + 49 = 666.

It is not a de Polignac number, because 61539082749 - 2¹³ = 61539074557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61539082695 and 61539082704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61539082849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71307892 + ... + 71308754.

It is an arithmetic number, because the mean of its divisors is an integer number (1462924800).

It is a 2-persistent number, because it is pandigital, and so is 2⋅61539082749 = 123078165498, but 3⋅61539082749 = 184617248247 is not.

Almost surely, 2^61539082749 is an apocalyptic number.

61539082749 is the 156894-th heptagonal number.

It is an amenable number.

61539082749 is a deficient number, since it is larger than the sum of its proper divisors (32088104451).

61539082749 is a wasteful number, since it uses less digits than its factorization.

61539082749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383 (or 1377 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 61539082749 in words is "sixty-one billion, five hundred thirty-nine million, eighty-two thousand, seven hundred forty-nine".