879902121209978 has 4 divisors (see below), whose sum is σ = 1319853181814970. Its totient is φ = 439951060604988.

The previous prime is 879902121209953. The next prime is 879902121210023.

879902121209978 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 546928054839049 + 332974066370929 = 23386493^2 + 18247577^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219975530302493 + ... + 219975530302496.

Almost surely, 2^{879902121209978} is an apocalyptic number.

879902121209978 is a deficient number, since it is larger than the sum of its proper divisors (439951060604992).

879902121209978 is a wasteful number, since it uses less digits than its factorization.

879902121209978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439951060604991.

The product of its (nonzero) digits is 164602368, while the sum is 74.

The spelling of 879902121209978 in words is "eight hundred seventy-nine trillion, nine hundred two billion, one hundred twenty-one million, two hundred nine thousand, nine hundred seventy-eight".