6535621398 has 8 divisors (see below), whose sum is σ = 13071242808. Its totient is φ = 2178540464.

The previous prime is 6535621381. The next prime is 6535621403. The reversal of 6535621398 is 8931265356.

It is a sphenic number, since it is the product of 3 distinct primes.

6535621398 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544635111 + ... + 544635122.

It is an arithmetic number, because the mean of its divisors is an integer number (1633905351).

Almost surely, 2^6535621398 is an apocalyptic number.

6535621398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6535621398 is a wasteful number, since it uses less digits than its factorization.

6535621398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089270238.

The product of its digits is 1166400, while the sum is 48.

The square root of 6535621398 is about 80843.1901770335. The cubic root of 6535621398 is about 1869.6585303083.

The spelling of 6535621398 in words is "six billion, five hundred thirty-five million, six hundred twenty-one thousand, three hundred ninety-eight".