7139911661 has 8 divisors (see below), whose sum is σ = 7389487104. Its totient is φ = 6891539760.

The previous prime is 7139911631. The next prime is 7139911687. The reversal of 7139911661 is 1661199317.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7139911661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7139911631) 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 7 ways as a sum of consecutive naturals, for example, 288806 + ... + 312551.

It is an arithmetic number, because the mean of its divisors is an integer number (923685888).

Almost surely, 2^7139911661 is an apocalyptic number.

It is an amenable number.

7139911661 is a deficient number, since it is larger than the sum of its proper divisors (249575443).

7139911661 is a wasteful number, since it uses less digits than its factorization.

7139911661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601771.

The product of its digits is 61236, while the sum is 44.

The square root of 7139911661 is about 84497.9979703661. The cubic root of 7139911661 is about 1925.5920289348.

The spelling of 7139911661 in words is "seven billion, one hundred thirty-nine million, nine hundred eleven thousand, six hundred sixty-one".