6521694420 has 48 divisors (see below), whose sum is σ = 18268705728. Its totient is φ = 1738360320.

The previous prime is 6521694401. The next prime is 6521694449. The reversal of 6521694420 is 244961256.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122535 + ... + 167505.

It is an arithmetic number, because the mean of its divisors is an integer number (380598036).

Almost surely, 2^6521694420 is an apocalyptic number.

6521694420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6521694420 is an abundant number, since it is smaller than the sum of its proper divisors (11747011308).

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

6521694420 is a wasteful number, since it uses less digits than its factorization.

6521694420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47400 (or 47398 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 6521694420 is about 80757.0084884278. The cubic root of 6521694420 is about 1868.3295462103.

The spelling of 6521694420 in words is "six billion, five hundred twenty-one million, six hundred ninety-four thousand, four hundred twenty".