70018487721 has 96 divisors (see below), whose sum is σ = 132081129600. Its totient is φ = 36326828160.

The previous prime is 70018487717. The next prime is 70018487743. The reversal of 70018487721 is 12778481007.

It is not a de Polignac number, because 70018487721 - 2² = 70018487717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70018487321) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1015770 + ... + 1082508.

It is an arithmetic number, because the mean of its divisors is an integer number (1375845100).

Almost surely, 2^70018487721 is an apocalyptic number.

It is an amenable number.

70018487721 is a deficient number, since it is larger than the sum of its proper divisors (62062641879).

70018487721 is a wasteful number, since it uses less digits than its factorization.

70018487721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66836 (or 66823 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The spelling of 70018487721 in words is "seventy billion, eighteen million, four hundred eighty-seven thousand, seven hundred twenty-one".