2645722121631 has 16 divisors (see below), whose sum is σ = 3571858391040. Its totient is φ = 1741791495200.

The previous prime is 2645722121591. The next prime is 2645722121633. The reversal of 2645722121631 is 1361212275462.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2645722121631 - 2¹³ = 2645722113439 is a prime.

It is a super-2 number, since 2×2645722121631² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645722121633) 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 15 ways as a sum of consecutive naturals, for example, 11283111 + ... + 11515208.

It is an arithmetic number, because the mean of its divisors is an integer number (223241149440).

Almost surely, 2^{2645722121631} is an apocalyptic number.

2645722121631 is a deficient number, since it is larger than the sum of its proper divisors (926136269409).

2645722121631 is a wasteful number, since it uses less digits than its factorization.

2645722121631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22798806.

The product of its digits is 241920, while the sum is 42.

The spelling of 2645722121631 in words is "two trillion, six hundred forty-five billion, seven hundred twenty-two million, one hundred twenty-one thousand, six hundred thirty-one".