70781916021 has 8 divisors (see below), whose sum is σ = 94379025024. Its totient is φ = 47186375520.

The previous prime is 70781915999. The next prime is 70781916041. The reversal of 70781916021 is 12061918707.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70781916021 - 2⁶ = 70781915957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70781916041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282445 + ... + 470466.

It is an arithmetic number, because the mean of its divisors is an integer number (11797378128).

Almost surely, 2^70781916021 is an apocalyptic number.

It is an amenable number.

70781916021 is a deficient number, since it is larger than the sum of its proper divisors (23597109003).

70781916021 is a wasteful number, since it uses less digits than its factorization.

70781916021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784251.

The product of its (nonzero) digits is 42336, while the sum is 42.

The spelling of 70781916021 in words is "seventy billion, seven hundred eighty-one million, nine hundred sixteen thousand, twenty-one".