1394165945521 has 4 divisors (see below), whose sum is σ = 1394432674672. Its totient is φ = 1393899216372.

The previous prime is 1394165945519. The next prime is 1394165945611. The reversal of 1394165945521 is 1255495614931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1394165945521 - 2¹ = 1394165945519 is a prime.

It is a super-2 number, since 2×1394165945521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1394165945021) 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, 133356735 + ... + 133367188.

It is an arithmetic number, because the mean of its divisors is an integer number (348608168668).

Almost surely, 2^{1394165945521} is an apocalyptic number.

It is an amenable number.

1394165945521 is a deficient number, since it is larger than the sum of its proper divisors (266729151).

1394165945521 is an equidigital number, since it uses as much as digits as its factorization.

1394165945521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266729150.

The product of its digits is 5832000, while the sum is 55.

The spelling of 1394165945521 in words is "one trillion, three hundred ninety-four billion, one hundred sixty-five million, nine hundred forty-five thousand, five hundred twenty-one".