978196726498 has 4 divisors (see below), whose sum is σ = 1467295089750. Its totient is φ = 489098363248.

The previous prime is 978196726489. The next prime is 978196726501. The reversal of 978196726498 is 894627691879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 894627691879 = 15439 ⋅57945961.

It can be written as a sum of positive squares in only one way, i.e., 884421750969 + 93774975529 = 940437^2 + 306227^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244549181623 + ... + 244549181626.

Almost surely, 2^978196726498 is an apocalyptic number.

978196726498 is a deficient number, since it is larger than the sum of its proper divisors (489098363252).

978196726498 is a wasteful number, since it uses less digits than its factorization.

978196726498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489098363251.

The product of its digits is 658409472, while the sum is 76.

The spelling of 978196726498 in words is "nine hundred seventy-eight billion, one hundred ninety-six million, seven hundred twenty-six thousand, four hundred ninety-eight".