70817821959 has 4 divisors (see below), whose sum is σ = 94423762616. Its totient is φ = 47211881304.

The previous prime is 70817821891. The next prime is 70817821973. The reversal of 70817821959 is 95912871807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95912871807 = 3 ⋅31970957269.

It is not a de Polignac number, because 70817821959 - 2⁸ = 70817821703 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70817821899 and 70817821908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70810821959) 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, 11802970324 + ... + 11802970329.

It is an arithmetic number, because the mean of its divisors is an integer number (23605940654).

Almost surely, 2^70817821959 is an apocalyptic number.

70817821959 is a deficient number, since it is larger than the sum of its proper divisors (23605940657).

70817821959 is a wasteful number, since it uses less digits than its factorization.

70817821959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23605940656.

The product of its (nonzero) digits is 2540160, while the sum is 57.

The spelling of 70817821959 in words is "seventy billion, eight hundred seventeen million, eight hundred twenty-one thousand, nine hundred fifty-nine".