66091796 has 6 divisors (see below), whose sum is σ = 115660650. Its totient is φ = 33045896.

The previous prime is 66091793. The next prime is 66091799. The reversal of 66091796 is 69719066.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66091793) and next prime (66091799).

It can be written as a sum of positive squares in only one way, i.e., 45751696 + 20340100 = 6764^2 + 4510^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66091793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8261471 + ... + 8261478.

It is an arithmetic number, because the mean of its divisors is an integer number (19276775).

Almost surely, 2^66091796 is an apocalyptic number.

66091796 is the 4346-th centered heptagonal number.

It is an amenable number.

66091796 is a deficient number, since it is larger than the sum of its proper divisors (49568854).

66091796 is a wasteful number, since it uses less digits than its factorization.

66091796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16522953 (or 16522951 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 66091796 is about 8129.6860948010. The cubic root of 66091796 is about 404.3112736855.

The spelling of 66091796 in words is "sixty-six million, ninety-one thousand, seven hundred ninety-six".