2643554061801 has 9 divisors (see below), whose sum is σ = 3818474023741. Its totient is φ = 1762366122732.

The previous prime is 2643554061779. The next prime is 2643554061809. The reversal of 2643554061801 is 1081604553462.

The square root of 2643554061801 is 1625901.

It is a perfect power (a square), and thus also a powerful number.

2643554061801 is a `hidden beast` number, since 2 + 6 + 43 + 5 + 540 + 61 + 8 + 0 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 2643554061801 - 2⁵ = 2643554061769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2643554061809) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4606720 + ... + 5148686.

Almost surely, 2^{2643554061801} is an apocalyptic number.

2643554061801 is the 1625901-st square number.

2643554061801 is the 812951-st centered octagonal number.

It is an amenable number.

2643554061801 is a deficient number, since it is larger than the sum of its proper divisors (1174919961940).

2643554061801 is an frugal number, since it uses more digits than its factorization.

2643554061801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083940 (or 541970 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 2643554061801 in words is "two trillion, six hundred forty-three billion, five hundred fifty-four million, sixty-one thousand, eight hundred one".