6491826545640 has 64 divisors (see below), whose sum is σ = 19508657837760. Its totient is φ = 1728204572160.

The previous prime is 6491826545549. The next prime is 6491826545681. The reversal of 6491826545640 is 465456281946.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 46010101 + ... + 46150980.

It is an arithmetic number, because the mean of its divisors is an integer number (304822778715).

Almost surely, 2^{6491826545640} is an apocalyptic number.

6491826545640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6491826545640 is an abundant number, since it is smaller than the sum of its proper divisors (13016831292120).

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

6491826545640 is a wasteful number, since it uses less digits than its factorization.

6491826545640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92161682 (or 92161678 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 60.

The spelling of 6491826545640 in words is "six trillion, four hundred ninety-one billion, eight hundred twenty-six million, five hundred forty-five thousand, six hundred forty".