1377745013721 has 16 divisors (see below), whose sum is σ = 2000355739200. Its totient is φ = 840149408448.

The previous prime is 1377745013693. The next prime is 1377745013731. The reversal of 1377745013721 is 1273105477731.

It is a happy number.

It is not a de Polignac number, because 1377745013721 - 2¹⁷ = 1377744882649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1377745013731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416739126 + ... + 416742431.

It is an arithmetic number, because the mean of its divisors is an integer number (125022233700).

Almost surely, 2^{1377745013721} is an apocalyptic number.

It is an amenable number.

1377745013721 is a deficient number, since it is larger than the sum of its proper divisors (622610725479).

1377745013721 is a wasteful number, since it uses less digits than its factorization.

1377745013721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833481608.

The product of its (nonzero) digits is 864360, while the sum is 48.

The spelling of 1377745013721 in words is "one trillion, three hundred seventy-seven billion, seven hundred forty-five million, thirteen thousand, seven hundred twenty-one".