1378901666279 has 4 divisors (see below), whose sum is σ = 1378905562800. Its totient is φ = 1378897769760.

The previous prime is 1378901666249. The next prime is 1378901666293. The reversal of 1378901666279 is 9726661098731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378901666279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378901666249) 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, 1357787 + ... + 2145084.

It is an arithmetic number, because the mean of its divisors is an integer number (344726390700).

Almost surely, 2^{1378901666279} is an apocalyptic number.

1378901666279 is a deficient number, since it is larger than the sum of its proper divisors (3896521).

1378901666279 is an equidigital number, since it uses as much as digits as its factorization.

1378901666279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896520.

The product of its (nonzero) digits is 41150592, while the sum is 65.

The spelling of 1378901666279 in words is "one trillion, three hundred seventy-eight billion, nine hundred one million, six hundred sixty-six thousand, two hundred seventy-nine".