70171615720 has 64 divisors (see below), whose sum is σ = 161891579520. Its totient is φ = 27359265024.

The previous prime is 70171615711. The next prime is 70171615729. The reversal of 70171615720 is 2751617107.

It is an interprime number because it is at equal distance from previous prime (70171615711) and next prime (70171615729).

It is a super-2 number, since 2×70171615720² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 70171615720.

It is not an unprimeable number, because it can be changed into a prime (70171615729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 795754 + ... + 879526.

It is an arithmetic number, because the mean of its divisors is an integer number (2529555930).

Almost surely, 2^70171615720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70171615720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80945789760).

70171615720 is an abundant number, since it is smaller than the sum of its proper divisors (91719963800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70171615720 is a wasteful number, since it uses less digits than its factorization.

70171615720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84314 (or 84310 counting only the distinct ones).

The product of its (nonzero) digits is 20580, while the sum is 37.

The spelling of 70171615720 in words is "seventy billion, one hundred seventy-one million, six hundred fifteen thousand, seven hundred twenty".