42879197906 has 4 divisors (see below), whose sum is σ = 64318796862. Its totient is φ = 21439598952.

The previous prime is 42879197897. The next prime is 42879197947. The reversal of 42879197906 is 60979197824.

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., 34330531225 + 8548666681 = 185285^2 + 92459^2 .

It is a super-2 number, since 2×42879197906² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10719799475 + ... + 10719799478.

Almost surely, 2^42879197906 is an apocalyptic number.

42879197906 is a deficient number, since it is larger than the sum of its proper divisors (21439598956).

42879197906 is a wasteful number, since it uses less digits than its factorization.

42879197906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21439598955.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 42879197906 in words is "forty-two billion, eight hundred seventy-nine million, one hundred ninety-seven thousand, nine hundred six".