1373257666 has 16 divisors (see below), whose sum is σ = 2289549888. Its totient is φ = 612430000.

The previous prime is 1373257601. The next prime is 1373257667. The reversal of 1373257666 is 6667523731.

It is not an unprimeable number, because it can be changed into a prime (1373257667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 587710 + ... + 590041.

It is an arithmetic number, because the mean of its divisors is an integer number (143096868).

Almost surely, 2^1373257666 is an apocalyptic number.

1373257666 is a deficient number, since it is larger than the sum of its proper divisors (916292222).

1373257666 is a wasteful number, since it uses less digits than its factorization.

1373257666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177817.

The product of its digits is 952560, while the sum is 46.

The square root of 1373257666 is about 37057.4913613968. The cubic root of 1373257666 is about 1111.5201599534.

It can be divided in two parts, 137325 and 7666, that added together give a triangular number (144991 = T₅₃₈).

The spelling of 1373257666 in words is "one billion, three hundred seventy-three million, two hundred fifty-seven thousand, six hundred sixty-six".