7661986129 has 16 divisors (see below), whose sum is σ = 8853618816. Its totient is φ = 6494832000.

The previous prime is 7661986103. The next prime is 7661986169. The reversal of 7661986129 is 9216891667.

It is a cyclic number.

It is not a de Polignac number, because 7661986129 - 2⁷ = 7661986001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7661986129.

It is not an unprimeable number, because it can be changed into a prime (7661986169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441639 + ... + 458659.

It is an arithmetic number, because the mean of its divisors is an integer number (553351176).

Almost surely, 2^7661986129 is an apocalyptic number.

It is an amenable number.

7661986129 is a deficient number, since it is larger than the sum of its proper divisors (1191632687).

7661986129 is a wasteful number, since it uses less digits than its factorization.

7661986129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17736.

The product of its digits is 1959552, while the sum is 55.

The square root of 7661986129 is about 87532.7717429307. The cubic root of 7661986129 is about 1971.4258814756.

The spelling of 7661986129 in words is "seven billion, six hundred sixty-one million, nine hundred eighty-six thousand, one hundred twenty-nine".