6511066161620 has 24 divisors (see below), whose sum is σ = 14477547113064. Its totient is φ = 2451224907776.

The previous prime is 6511066161571. The next prime is 6511066161647. The reversal of 6511066161620 is 261616601156.

It can be written as a sum of positive squares in 4 ways, for example, as 1368530304964 + 5142535856656 = 1169842^2 + 2267716^2 .

It is a super-2 number, since 2×6511066161620² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9575096957 + ... + 9575097636.

It is an arithmetic number, because the mean of its divisors is an integer number (603231129711).

Almost surely, 2^{6511066161620} is an apocalyptic number.

It is an amenable number.

6511066161620 is an abundant number, since it is smaller than the sum of its proper divisors (7966480951444).

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

6511066161620 is a wasteful number, since it uses less digits than its factorization.

6511066161620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19150194619 (or 19150194617 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 6511066161620 in words is "six trillion, five hundred eleven billion, sixty-six million, one hundred sixty-one thousand, six hundred twenty".