70166784721 has 4 divisors (see below), whose sum is σ = 76545583344. Its totient is φ = 63787986100.

The previous prime is 70166784707. The next prime is 70166784773. The reversal of 70166784721 is 12748766107.

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.

It is a cyclic number.

It is not a de Polignac number, because 70166784721 - 2⁷ = 70166784593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70166784781) 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, 3189399295 + ... + 3189399316.

It is an arithmetic number, because the mean of its divisors is an integer number (19136395836).

Almost surely, 2^70166784721 is an apocalyptic number.

It is an amenable number.

70166784721 is a deficient number, since it is larger than the sum of its proper divisors (6378798623).

70166784721 is a wasteful number, since it uses less digits than its factorization.

70166784721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6378798622.

The product of its (nonzero) digits is 790272, while the sum is 49.

The spelling of 70166784721 in words is "seventy billion, one hundred sixty-six million, seven hundred eighty-four thousand, seven hundred twenty-one".