1661392346827 has 2 divisors, whose sum is σ = 1661392346828. Its totient is φ = 1661392346826.

The previous prime is 1661392346819. The next prime is 1661392346879. The reversal of 1661392346827 is 7286432931661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661392346827 - 2³ = 1661392346819 is a prime.

It is not a weakly prime, because it can be changed into another prime (1661392346807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830696173413 + 830696173414.

It is an arithmetic number, because the mean of its divisors is an integer number (830696173414).

Almost surely, 2^{1661392346827} is an apocalyptic number.

1661392346827 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661392346827 is an equidigital number, since it uses as much as digits as its factorization.

1661392346827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 58.

The spelling of 1661392346827 in words is "one trillion, six hundred sixty-one billion, three hundred ninety-two million, three hundred forty-six thousand, eight hundred twenty-seven".