1243601161566 has 32 divisors (see below), whose sum is σ = 2620815394560. Its totient is φ = 392310003456.

The previous prime is 1243601161541. The next prime is 1243601161591. The reversal of 1243601161566 is 6651611063421.

It is an interprime number because it is at equal distance from previous prime (1243601161541) and next prime (1243601161591).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5530291 + ... + 5750766.

It is an arithmetic number, because the mean of its divisors is an integer number (81900481080).

Almost surely, 2^{1243601161566} is an apocalyptic number.

1243601161566 is an abundant number, since it is smaller than the sum of its proper divisors (1377214232994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243601161566 is a wasteful number, since it uses less digits than its factorization.

1243601161566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11282048.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 1243601161566 in words is "one trillion, two hundred forty-three billion, six hundred one million, one hundred sixty-one thousand, five hundred sixty-six".