2649045052921 has 2 divisors, whose sum is σ = 2649045052922. Its totient is φ = 2649045052920.

The previous prime is 2649045052919. The next prime is 2649045052937. The reversal of 2649045052921 is 1292505409462.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2565907404025 + 83137648896 = 1601845^2 + 288336^2 .

It is a cyclic number.

It is not a de Polignac number, because 2649045052921 - 2¹ = 2649045052919 is a prime.

Together with 2649045052919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2649045052321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1324522526460 + 1324522526461.

It is an arithmetic number, because the mean of its divisors is an integer number (1324522526461).

Almost surely, 2^{2649045052921} is an apocalyptic number.

It is an amenable number.

2649045052921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2649045052921 is an equidigital number, since it uses as much as digits as its factorization.

2649045052921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 2649045052921 in words is "two trillion, six hundred forty-nine billion, forty-five million, fifty-two thousand, nine hundred twenty-one".