42149808851 has 4 divisors (see below), whose sum is σ = 43288992912. Its totient is φ = 41010624792.

The previous prime is 42149808787. The next prime is 42149808863. The reversal of 42149808851 is 15880894124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42149808851 - 2⁶ = 42149808787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42149808851.

It is not an unprimeable number, because it can be changed into a prime (42149808871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569591975 + ... + 569592048.

It is an arithmetic number, because the mean of its divisors is an integer number (10822248228).

Almost surely, 2^42149808851 is an apocalyptic number.

42149808851 is a deficient number, since it is larger than the sum of its proper divisors (1139184061).

42149808851 is a wasteful number, since it uses less digits than its factorization.

42149808851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139184060.

The product of its (nonzero) digits is 737280, while the sum is 50.

The spelling of 42149808851 in words is "forty-two billion, one hundred forty-nine million, eight hundred eight thousand, eight hundred fifty-one".