70850557657 has 4 divisors (see below), whose sum is σ = 77291517456. Its totient is φ = 64409597860.

The previous prime is 70850557649. The next prime is 70850557663. The reversal of 70850557657 is 75675505807.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75675505807 = 11 ⋅6879591437.

It is a cyclic number.

It is not a de Polignac number, because 70850557657 - 2³ = 70850557649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 70850557598 and 70850557607.

It is not an unprimeable number, because it can be changed into a prime (70850557957) 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, 3220479883 + ... + 3220479904.

It is an arithmetic number, because the mean of its divisors is an integer number (19322879364).

Almost surely, 2^70850557657 is an apocalyptic number.

It is an amenable number.

70850557657 is a deficient number, since it is larger than the sum of its proper divisors (6440959799).

70850557657 is a wasteful number, since it uses less digits than its factorization.

70850557657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6440959798.

The product of its (nonzero) digits is 10290000, while the sum is 55.

The spelling of 70850557657 in words is "seventy billion, eight hundred fifty million, five hundred fifty-seven thousand, six hundred fifty-seven".