42757507381 has 4 divisors (see below), whose sum is σ = 45272654892. Its totient is φ = 40242359872.

The previous prime is 42757507379. The next prime is 42757507399. The reversal of 42757507381 is 18370575724.

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 15989602500 + 26767904881 = 126450^2 + 163609^2 .

It is a cyclic number.

It is not a de Polignac number, because 42757507381 - 2¹ = 42757507379 is a prime.

It is a super-2 number, since 2×42757507381² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42757507781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1257573730 + ... + 1257573763.

It is an arithmetic number, because the mean of its divisors is an integer number (11318163723).

Almost surely, 2^42757507381 is an apocalyptic number.

It is an amenable number.

42757507381 is a deficient number, since it is larger than the sum of its proper divisors (2515147511).

42757507381 is a wasteful number, since it uses less digits than its factorization.

42757507381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515147510.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 42757507381 in words is "forty-two billion, seven hundred fifty-seven million, five hundred seven thousand, three hundred eighty-one".