6998523621 has 4 divisors (see below), whose sum is σ = 9331364832. Its totient is φ = 4665682412.

The previous prime is 6998523617. The next prime is 6998523683. The reversal of 6998523621 is 1263258996.

6998523621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6998523621 - 2² = 6998523617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6998523691) 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, 1166420601 + ... + 1166420606.

It is an arithmetic number, because the mean of its divisors is an integer number (2332841208).

Almost surely, 2^6998523621 is an apocalyptic number.

It is an amenable number.

6998523621 is a deficient number, since it is larger than the sum of its proper divisors (2332841211).

6998523621 is a wasteful number, since it uses less digits than its factorization.

6998523621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332841210.

The product of its digits is 1399680, while the sum is 51.

The square root of 6998523621 is about 83657.1791360431. The cubic root of 6998523621 is about 1912.7966870580.

The spelling of 6998523621 in words is "six billion, nine hundred ninety-eight million, five hundred twenty-three thousand, six hundred twenty-one".