42720151777 has 4 divisors (see below), whose sum is σ = 43420482196. Its totient is φ = 42019821360.

The previous prime is 42720151759. The next prime is 42720151811. The reversal of 42720151777 is 77715102724.

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 19188898576 + 23531253201 = 138524^2 + 153399^2 .

It is a cyclic number.

It is not a de Polignac number, because 42720151777 - 2³⁵ = 8360413409 is a prime.

It is a super-2 number, since 2×42720151777² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42720152777) 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 3 ways as a sum of consecutive naturals, for example, 350165118 + ... + 350165239.

It is an arithmetic number, because the mean of its divisors is an integer number (10855120549).

Almost surely, 2^42720151777 is an apocalyptic number.

It is an amenable number.

42720151777 is a deficient number, since it is larger than the sum of its proper divisors (700330419).

42720151777 is an equidigital number, since it uses as much as digits as its factorization.

42720151777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700330418.

The product of its (nonzero) digits is 192080, while the sum is 43.

The spelling of 42720151777 in words is "forty-two billion, seven hundred twenty million, one hundred fifty-one thousand, seven hundred seventy-seven".