1377442570721 has 4 divisors (see below), whose sum is σ = 1574220080832. Its totient is φ = 1180665060612.

The previous prime is 1377442570711. The next prime is 1377442570723. The reversal of 1377442570721 is 1270752447731.

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 1377442570721 - 2²² = 1377438376417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377442570721.

It is not an unprimeable number, because it can be changed into a prime (1377442570723) 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, 98388755045 + ... + 98388755058.

It is an arithmetic number, because the mean of its divisors is an integer number (393555020208).

Almost surely, 2^{1377442570721} is an apocalyptic number.

It is an amenable number.

1377442570721 is a deficient number, since it is larger than the sum of its proper divisors (196777510111).

1377442570721 is an equidigital number, since it uses as much as digits as its factorization.

1377442570721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196777510110.

The product of its (nonzero) digits is 2304960, while the sum is 50.

The spelling of 1377442570721 in words is "one trillion, three hundred seventy-seven billion, four hundred forty-two million, five hundred seventy thousand, seven hundred twenty-one".