1320518817727 has 4 divisors (see below), whose sum is σ = 1363116198976. Its totient is φ = 1277921436480.

The previous prime is 1320518817707. The next prime is 1320518817757. The reversal of 1320518817727 is 7277188150231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320518817727 is a prime.

It is a super-2 number, since 2×1320518817727² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320518817707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21298690578 + ... + 21298690639.

It is an arithmetic number, because the mean of its divisors is an integer number (340779049744).

Almost surely, 2^{1320518817727} is an apocalyptic number.

1320518817727 is a deficient number, since it is larger than the sum of its proper divisors (42597381249).

1320518817727 is an equidigital number, since it uses as much as digits as its factorization.

1320518817727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42597381248.

The product of its (nonzero) digits is 1317120, while the sum is 52.

The spelling of 1320518817727 in words is "one trillion, three hundred twenty billion, five hundred eighteen million, eight hundred seventeen thousand, seven hundred twenty-seven".