7042545891 has 40 divisors (see below), whose sum is σ = 10783208304. Its totient is φ = 4578094080.

The previous prime is 7042545799. The next prime is 7042545899. The reversal of 7042545891 is 1985452407.

7042545891 is a `hidden beast` number, since 70 + 42 + 5 + 458 + 91 = 666.

It is not a de Polignac number, because 7042545891 - 2¹⁵ = 7042513123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7042545899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2649235 + ... + 2651891.

Almost surely, 2^7042545891 is an apocalyptic number.

7042545891 is a deficient number, since it is larger than the sum of its proper divisors (3740662413).

7042545891 is a wasteful number, since it uses less digits than its factorization.

7042545891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3473 (or 3464 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 7042545891 is about 83919.8778061551. The cubic root of 7042545891 is about 1916.7989459035.

The spelling of 7042545891 in words is "seven billion, forty-two million, five hundred forty-five thousand, eight hundred ninety-one".