8521393416418 has 4 divisors (see below), whose sum is σ = 12782090124630. Its totient is φ = 4260696708208.

The previous prime is 8521393416409. The next prime is 8521393416443. The reversal of 8521393416418 is 8146143931258.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4461502899529 + 4059890516889 = 2112227^2 + 2014917^2 .

It is a super-2 number, since 2×8521393416418² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2130348354103 + ... + 2130348354106.

Almost surely, 2^{8521393416418} is an apocalyptic number.

8521393416418 is a deficient number, since it is larger than the sum of its proper divisors (4260696708212).

8521393416418 is a wasteful number, since it uses less digits than its factorization.

8521393416418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260696708211.

The product of its digits is 4976640, while the sum is 55.

The spelling of 8521393416418 in words is "eight trillion, five hundred twenty-one billion, three hundred ninety-three million, four hundred sixteen thousand, four hundred eighteen".