7666661426 has 16 divisors (see below), whose sum is σ = 11762539200. Its totient is φ = 3746566608.

The previous prime is 7666661419. The next prime is 7666661489. The reversal of 7666661426 is 6241666667.

It is an unprimeable number.

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, 167366 + ... + 208193.

It is an arithmetic number, because the mean of its divisors is an integer number (735158700).

Almost surely, 2^7666661426 is an apocalyptic number.

7666661426 is a deficient number, since it is larger than the sum of its proper divisors (4095877774).

7666661426 is a wasteful number, since it uses less digits than its factorization.

7666661426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375793.

The product of its digits is 2612736, while the sum is 50.

The square root of 7666661426 is about 87559.4736507707. The cubic root of 7666661426 is about 1971.8267839426.

The spelling of 7666661426 in words is "seven billion, six hundred sixty-six million, six hundred sixty-one thousand, four hundred twenty-six".