315861981885854 has 4 divisors (see below), whose sum is σ = 473792972828784. Its totient is φ = 157930990942926.

The previous prime is 315861981885851. The next prime is 315861981885871. The reversal of 315861981885854 is 458588189168513.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315861981885851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78965495471462 + ... + 78965495471465.

It is an arithmetic number, because the mean of its divisors is an integer number (118448243207196).

Almost surely, 2^{315861981885854} is an apocalyptic number.

315861981885854 is a deficient number, since it is larger than the sum of its proper divisors (157930990942930).

315861981885854 is a wasteful number, since it uses less digits than its factorization.

315861981885854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157930990942929.

The product of its digits is 2654208000, while the sum is 80.

The spelling of 315861981885854 in words is "three hundred fifteen trillion, eight hundred sixty-one billion, nine hundred eighty-one million, eight hundred eighty-five thousand, eight hundred fifty-four".