42149650777 has 4 divisors (see below), whose sum is σ = 45391931620. Its totient is φ = 38907369936.

The previous prime is 42149650769. The next prime is 42149650793. The reversal of 42149650777 is 77705694124.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3168676681 + 38980974096 = 56291^2 + 197436^2 .

It is a cyclic number.

It is not a de Polignac number, because 42149650777 - 2³ = 42149650769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42149650727) 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, 1621140402 + ... + 1621140427.

It is an arithmetic number, because the mean of its divisors is an integer number (11347982905).

Almost surely, 2^42149650777 is an apocalyptic number.

It is an amenable number.

42149650777 is a deficient number, since it is larger than the sum of its proper divisors (3242280843).

42149650777 is a wasteful number, since it uses less digits than its factorization.

42149650777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242280842.

The product of its (nonzero) digits is 2963520, while the sum is 52.

The spelling of 42149650777 in words is "forty-two billion, one hundred forty-nine million, six hundred fifty thousand, seven hundred seventy-seven".