8661249069 has 16 divisors (see below), whose sum is σ = 13032601920. Its totient is φ = 5068232960.

The previous prime is 8661249043. The next prime is 8661249083. The reversal of 8661249069 is 9609421668.

It is a cyclic number.

It is not a de Polignac number, because 8661249069 - 2¹² = 8661244973 is a prime.

It is a super-2 number, since 2×8661249069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8661247069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4524252 + ... + 4526165.

It is an arithmetic number, because the mean of its divisors is an integer number (814537620).

Almost surely, 2^8661249069 is an apocalyptic number.

It is an amenable number.

8661249069 is a deficient number, since it is larger than the sum of its proper divisors (4371352851).

8661249069 is a wasteful number, since it uses less digits than its factorization.

8661249069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9050460.

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 8661249069 is about 93065.8319094607. The cubic root of 8661249069 is about 2053.6519531398.

The spelling of 8661249069 in words is "eight billion, six hundred sixty-one million, two hundred forty-nine thousand, sixty-nine".