70615517221 has 4 divisors (see below), whose sum is σ = 70629242112. Its totient is φ = 70601792332.

The previous prime is 70615517209. The next prime is 70615517257. The reversal of 70615517221 is 12271551607.

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: 12271551607 = 7 ⋅1753078801.

It is a cyclic number.

It is not a de Polignac number, because 70615517221 - 2⁹ = 70615516709 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 (70615517261) 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, 6854725 + ... + 6865018.

It is an arithmetic number, because the mean of its divisors is an integer number (17657310528).

Almost surely, 2^70615517221 is an apocalyptic number.

It is an amenable number.

70615517221 is a deficient number, since it is larger than the sum of its proper divisors (13724891).

70615517221 is a wasteful number, since it uses less digits than its factorization.

70615517221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13724890.

The product of its (nonzero) digits is 29400, while the sum is 37.

The spelling of 70615517221 in words is "seventy billion, six hundred fifteen million, five hundred seventeen thousand, two hundred twenty-one".