6545699156961 has 12 divisors (see below), whose sum is σ = 9454926990288. Its totient is φ = 4363786418904.

The previous prime is 6545699156933. The next prime is 6545699156989. The reversal of 6545699156961 is 1696519965456.

6545699156961 is a `hidden beast` number, since 6 + 5 + 4 + 56 + 9 + 9 + 1 + 569 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (6545699156933) and next prime (6545699156989).

It is not a de Polignac number, because 6545699156961 - 2⁶ = 6545699156897 is a prime.

It is a super-3 number, since 3×6545699156961³ (a number of 39 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 6545699156961.

It is not an unprimeable number, because it can be changed into a prime (6545699156911) 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, 2850766 + ... + 4606328.

It is an arithmetic number, because the mean of its divisors is an integer number (787910582524).

Almost surely, 2^{6545699156961} is an apocalyptic number.

It is an amenable number.

6545699156961 is a deficient number, since it is larger than the sum of its proper divisors (2909227833327).

6545699156961 is a wasteful number, since it uses less digits than its factorization.

6545699156961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169852 (or 2169849 counting only the distinct ones).

The product of its digits is 472392000, while the sum is 72.

The spelling of 6545699156961 in words is "six trillion, five hundred forty-five billion, six hundred ninety-nine million, one hundred fifty-six thousand, nine hundred sixty-one".