42774251891 has 16 divisors (see below), whose sum is σ = 49321721856. Its totient is φ = 36336607776.

The previous prime is 42774251881. The next prime is 42774251959. The reversal of 42774251891 is 19815247724.

It is a happy number.

It is not a de Polignac number, because 42774251891 - 2⁶ = 42774251827 is a prime.

It is a super-3 number, since 3×42774251891³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42774251801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 834785 + ... + 884541.

It is an arithmetic number, because the mean of its divisors is an integer number (3082607616).

Almost surely, 2^42774251891 is an apocalyptic number.

42774251891 is a deficient number, since it is larger than the sum of its proper divisors (6547469965).

42774251891 is a wasteful number, since it uses less digits than its factorization.

42774251891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50858.

The product of its digits is 1128960, while the sum is 50.

The spelling of 42774251891 in words is "forty-two billion, seven hundred seventy-four million, two hundred fifty-one thousand, eight hundred ninety-one".