2621066545381 has 2 divisors, whose sum is σ = 2621066545382. Its totient is φ = 2621066545380.

The previous prime is 2621066545271. The next prime is 2621066545387. The reversal of 2621066545381 is 1835456601262.

2621066545381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2008642914756 + 612423630625 = 1417266^2 + 782575^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621066545381 - 2¹³ = 2621066537189 is a prime.

It is a super-2 number, since 2×2621066545381² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2621066545387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310533272690 + 1310533272691.

It is an arithmetic number, because the mean of its divisors is an integer number (1310533272691).

Almost surely, 2^{2621066545381} is an apocalyptic number.

It is an amenable number.

2621066545381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621066545381 is an equidigital number, since it uses as much as digits as its factorization.

2621066545381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 2621066545381 in words is "two trillion, six hundred twenty-one billion, sixty-six million, five hundred forty-five thousand, three hundred eighty-one".