6404690641040 has 40 divisors (see below), whose sum is σ = 15538336429248. Its totient is φ = 2450490331520.

The previous prime is 6404690641039. The next prime is 6404690641121. The reversal of 6404690641040 is 401460964046.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×6404690641040² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6404690640982 and 6404690641000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1740403226 + ... + 1740406905.

Almost surely, 2^{6404690641040} is an apocalyptic number.

It is an amenable number.

6404690641040 is an abundant number, since it is smaller than the sum of its proper divisors (9133645788208).

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

6404690641040 is a wasteful number, since it uses less digits than its factorization.

6404690641040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480810167 (or 3480810161 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 6404690641040 in words is "six trillion, four hundred four billion, six hundred ninety million, six hundred forty-one thousand, forty".