1978134196519 has 8 divisors (see below), whose sum is σ = 2130311209040. Its totient is φ = 1825959018816.

The previous prime is 1978134196499. The next prime is 1978134196529. The reversal of 1978134196519 is 9156914318791.

It is a happy number.

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 1978134196519 - 2¹¹ = 1978134194471 is a prime.

It is a super-2 number, since 2×1978134196519² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978134196529) 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, 2475784 + ... + 3175810.

It is an arithmetic number, because the mean of its divisors is an integer number (266288901130).

Almost surely, 2^{1978134196519} is an apocalyptic number.

1978134196519 is a deficient number, since it is larger than the sum of its proper divisors (152177012521).

1978134196519 is a wasteful number, since it uses less digits than its factorization.

1978134196519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917409.

The product of its digits is 14696640, while the sum is 64.

The spelling of 1978134196519 in words is "one trillion, nine hundred seventy-eight billion, one hundred thirty-four million, one hundred ninety-six thousand, five hundred nineteen".