1661227515307 has 2 divisors, whose sum is σ = 1661227515308. Its totient is φ = 1661227515306.

The previous prime is 1661227515293. The next prime is 1661227515329. The reversal of 1661227515307 is 7035157221661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661227515307 - 2⁷ = 1661227515179 is a prime.

It is a super-2 number, since 2×1661227515307² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1661227515347) 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 as a sum of consecutive naturals, namely, 830613757653 + 830613757654.

It is an arithmetic number, because the mean of its divisors is an integer number (830613757654).

Almost surely, 2^{1661227515307} is an apocalyptic number.

1661227515307 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661227515307 is an equidigital number, since it uses as much as digits as its factorization.

1661227515307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 1661227515307 in words is "one trillion, six hundred sixty-one billion, two hundred twenty-seven million, five hundred fifteen thousand, three hundred seven".