2045661243 has 8 divisors (see below), whose sum is σ = 2760410688. Its totient is φ = 1347342984.

The previous prime is 2045661209. The next prime is 2045661251. The reversal of 2045661243 is 3421665402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2045661243 - 2⁶ = 2045661179 is a prime.

It is a super-2 number, since 2×2045661243² = 8369459842224610098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2045661283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4107505 + ... + 4108002.

It is an arithmetic number, because the mean of its divisors is an integer number (345051336).

Almost surely, 2^2045661243 is an apocalyptic number.

2045661243 is a deficient number, since it is larger than the sum of its proper divisors (714749445).

2045661243 is an equidigital number, since it uses as much as digits as its factorization.

2045661243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8215593.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 2045661243 is about 45228.9867562827. The cubic root of 2045661243 is about 1269.4372531076.

The spelling of 2045661243 in words is "two billion, forty-five million, six hundred sixty-one thousand, two hundred forty-three".