2745061821 has 24 divisors (see below), whose sum is σ = 4060536480. Its totient is φ = 1786057056.

The previous prime is 2745061801. The next prime is 2745061829. The reversal of 2745061821 is 1281605472.

2745061821 is a `hidden beast` number, since 2 + 74 + 506 + 1 + 82 + 1 = 666.

It is not a de Polignac number, because 2745061821 - 2²³ = 2736673213 is a prime.

It is a super-2 number, since 2×2745061821² = 15070728802223672082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2745061829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 724510 + ... + 728288.

It is an arithmetic number, because the mean of its divisors is an integer number (169189020).

Almost surely, 2^2745061821 is an apocalyptic number.

It is an amenable number.

2745061821 is a deficient number, since it is larger than the sum of its proper divisors (1315474659).

2745061821 is a wasteful number, since it uses less digits than its factorization.

2745061821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705 (or 5702 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 2745061821 is about 52393.3375630910. The cubic root of 2745061821 is about 1400.1805585150.

The spelling of 2745061821 in words is "two billion, seven hundred forty-five million, sixty-one thousand, eight hundred twenty-one".