1376661457 has 4 divisors (see below), whose sum is σ = 1382146416. Its totient is φ = 1371176500.

The previous prime is 1376661449. The next prime is 1376661487. The reversal of 1376661457 is 7541666731.

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 1376661457 - 2³ = 1376661449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1376661427) 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, 2742103 + ... + 2742604.

It is an arithmetic number, because the mean of its divisors is an integer number (345536604).

Almost surely, 2^1376661457 is an apocalyptic number.

It is an amenable number.

1376661457 is a deficient number, since it is larger than the sum of its proper divisors (5484959).

1376661457 is an equidigital number, since it uses as much as digits as its factorization.

1376661457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484958.

The product of its digits is 635040, while the sum is 46.

The square root of 1376661457 is about 37103.3887535896. The cubic root of 1376661457 is about 1112.4377495278.

The spelling of 1376661457 in words is "one billion, three hundred seventy-six million, six hundred sixty-one thousand, four hundred fifty-seven".