1978151860079 has 4 divisors (see below), whose sum is σ = 1988401351776. Its totient is φ = 1967902368384.

The previous prime is 1978151860033. The next prime is 1978151860141. The reversal of 1978151860079 is 9700681518791.

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-1978151860079 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 (1978151860019) 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, 5124745559 + ... + 5124745944.

It is an arithmetic number, because the mean of its divisors is an integer number (497100337944).

Almost surely, 2^{1978151860079} is an apocalyptic number.

1978151860079 is a deficient number, since it is larger than the sum of its proper divisors (10249491697).

1978151860079 is a wasteful number, since it uses less digits than its factorization.

1978151860079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10249491696.

The product of its (nonzero) digits is 7620480, while the sum is 62.

The spelling of 1978151860079 in words is "one trillion, nine hundred seventy-eight billion, one hundred fifty-one million, eight hundred sixty thousand, seventy-nine".