2645211521061 has 6 divisors (see below), whose sum is σ = 3820861085990. Its totient is φ = 1763474347368.

The previous prime is 2645211521047. The next prime is 2645211521123. The reversal of 2645211521061 is 1601251125462.

2645211521061 is a `hidden beast` number, since 2 + 64 + 5 + 2 + 11 + 521 + 0 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2506823057025 + 138388464036 = 1583295^2 + 372006^2 .

It is not a de Polignac number, because 2645211521061 - 2¹³ = 2645211512869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645211121061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146956195606 + ... + 146956195623.

Almost surely, 2^{2645211521061} is an apocalyptic number.

It is an amenable number.

2645211521061 is a deficient number, since it is larger than the sum of its proper divisors (1175649564929).

2645211521061 is a wasteful number, since it uses less digits than its factorization.

2645211521061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293912391235 (or 293912391232 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 2645211521061 in words is "two trillion, six hundred forty-five billion, two hundred eleven million, five hundred twenty-one thousand, sixty-one".