1978169112676 has 27 divisors (see below), whose sum is σ = 3483476624467. Its totient is φ = 982928419640.

The previous prime is 1978169112653. The next prime is 1978169112697. The reversal of 1978169112676 is 6762119618791.

It is a happy number.

The square root of 1978169112676 is 1406474.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 469760211 + ... + 469764421.

Almost surely, 2^{1978169112676} is an apocalyptic number.

1978169112676 is the 1406474-th square number.

It is an amenable number.

1978169112676 is a deficient number, since it is larger than the sum of its proper divisors (1505307511791).

1978169112676 is an frugal number, since it uses more digits than its factorization.

1978169112676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8760 (or 4380 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 64.

Multiplying 1978169112676 by its sum of digits (64), we get a square (126602823211264 = 11251792²).

The spelling of 1978169112676 in words is "one trillion, nine hundred seventy-eight billion, one hundred sixty-nine million, one hundred twelve thousand, six hundred seventy-six".