7755393661 has 16 divisors (see below), whose sum is σ = 7988238720. Its totient is φ = 7526652480.

The previous prime is 7755393649. The next prime is 7755393677. The reversal of 7755393661 is 1663935577.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7755393661 is a prime.

It is a super-2 number, since 2×7755393661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7755393599 and 7755393608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7755393601) 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 15 ways as a sum of consecutive naturals, for example, 1413255 + ... + 1418731.

It is an arithmetic number, because the mean of its divisors is an integer number (499264920).

Almost surely, 2^7755393661 is an apocalyptic number.

It is an amenable number.

7755393661 is a deficient number, since it is larger than the sum of its proper divisors (232845059).

7755393661 is a wasteful number, since it uses less digits than its factorization.

7755393661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5844.

The product of its digits is 3572100, while the sum is 52.

The square root of 7755393661 is about 88064.7129161278. The cubic root of 7755393661 is about 1979.4047849524.

The spelling of 7755393661 in words is "seven billion, seven hundred fifty-five million, three hundred ninety-three thousand, six hundred sixty-one".