6446400252061 has 12 divisors (see below), whose sum is σ = 8097957342496. Its totient is φ = 5023169026920.

The previous prime is 6446400252053. The next prime is 6446400252091. The reversal of 6446400252061 is 1602520046446.

It is a happy number.

It is not a de Polignac number, because 6446400252061 - 2³ = 6446400252053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446400252011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3805430235 + ... + 3805431928.

Almost surely, 2^{6446400252061} is an apocalyptic number.

It is an amenable number.

6446400252061 is a deficient number, since it is larger than the sum of its proper divisors (1651557090435).

6446400252061 is a wasteful number, since it uses less digits than its factorization.

6446400252061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7610862192 (or 7610862181 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 6446400252061 in words is "six trillion, four hundred forty-six billion, four hundred million, two hundred fifty-two thousand, sixty-one".