6544620497961 has 48 divisors (see below), whose sum is σ = 12247243066240. Its totient is φ = 3270417638400.

The previous prime is 6544620497953. The next prime is 6544620497981. The reversal of 6544620497961 is 1697940264456.

It is a happy number.

6544620497961 is a `hidden beast` number, since 6 + 5 + 4 + 462 + 0 + 49 + 79 + 61 = 666.

It is not a de Polignac number, because 6544620497961 - 2³ = 6544620497953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (6544620497911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 210273640 + ... + 210304761.

Almost surely, 2^{6544620497961} is an apocalyptic number.

It is an amenable number.

6544620497961 is a deficient number, since it is larger than the sum of its proper divisors (5702622568279).

6544620497961 is a wasteful number, since it uses less digits than its factorization.

6544620497961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420578446 (or 420578443 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 63.

The spelling of 6544620497961 in words is "six trillion, five hundred forty-four billion, six hundred twenty million, four hundred ninety-seven thousand, nine hundred sixty-one".