66157090333421 has 2 divisors, whose sum is σ = 66157090333422. Its totient is φ = 66157090333420.

The previous prime is 66157090333403. The next prime is 66157090333507. The reversal of 66157090333421 is 12433309075166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48600571330921 + 17556519002500 = 6971411^2 + 4190050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66157090333421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66157090333421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66157090333021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078545166710 + 33078545166711.

It is an arithmetic number, because the mean of its divisors is an integer number (33078545166711).

Almost surely, 2^{66157090333421} is an apocalyptic number.

It is an amenable number.

66157090333421 is a deficient number, since it is larger than the sum of its proper divisors (1).

66157090333421 is an equidigital number, since it uses as much as digits as its factorization.

66157090333421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 50.

The spelling of 66157090333421 in words is "sixty-six trillion, one hundred fifty-seven billion, ninety million, three hundred thirty-three thousand, four hundred twenty-one".