1378370231661 has 8 divisors (see below), whose sum is σ = 1917732496320. Its totient is φ = 878960727392.

The previous prime is 1378370231647. The next prime is 1378370231669. The reversal of 1378370231661 is 1661320738731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1378370231661 - 2⁷ = 1378370231533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1378370231661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378370231669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9988190016 + ... + 9988190153.

It is an arithmetic number, because the mean of its divisors is an integer number (239716562040).

Almost surely, 2^{1378370231661} is an apocalyptic number.

It is an amenable number.

1378370231661 is a deficient number, since it is larger than the sum of its proper divisors (539362264659).

1378370231661 is a wasteful number, since it uses less digits than its factorization.

1378370231661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19976380195.

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 1378370231661 in words is "one trillion, three hundred seventy-eight billion, three hundred seventy million, two hundred thirty-one thousand, six hundred sixty-one".