70721748071 has 4 divisors (see below), whose sum is σ = 76161882552. Its totient is φ = 65281613592.

The previous prime is 70721748047. The next prime is 70721748107. The reversal of 70721748071 is 17084712707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17084712707 = 9439 ⋅1810013.

It is a de Polignac number, because none of the positive numbers 2^k-70721748071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70721748011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2720067221 + ... + 2720067246.

It is an arithmetic number, because the mean of its divisors is an integer number (19040470638).

Almost surely, 2^70721748071 is an apocalyptic number.

70721748071 is a deficient number, since it is larger than the sum of its proper divisors (5440134481).

70721748071 is a wasteful number, since it uses less digits than its factorization.

70721748071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5440134480.

The product of its (nonzero) digits is 153664, while the sum is 44.

The spelling of 70721748071 in words is "seventy billion, seven hundred twenty-one million, seven hundred forty-eight thousand, seventy-one".