70721696723 has 4 divisors (see below), whose sum is σ = 70728513168. Its totient is φ = 70714880280.

The previous prime is 70721696687. The next prime is 70721696743. The reversal of 70721696723 is 32769612707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32769612707 = 13 ⋅2520739439.

It is a cyclic number.

It is not a de Polignac number, because 70721696723 - 2¹⁴ = 70721680339 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70721696743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3392636 + ... + 3413417.

It is an arithmetic number, because the mean of its divisors is an integer number (17682128292).

Almost surely, 2^70721696723 is an apocalyptic number.

70721696723 is a deficient number, since it is larger than the sum of its proper divisors (6816445).

70721696723 is a wasteful number, since it uses less digits than its factorization.

70721696723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6816444.

The product of its (nonzero) digits is 1333584, while the sum is 50.

The spelling of 70721696723 in words is "seventy billion, seven hundred twenty-one million, six hundred ninety-six thousand, seven hundred twenty-three".