42657761387 has 2 divisors, whose sum is σ = 42657761388. Its totient is φ = 42657761386.

The previous prime is 42657761359. The next prime is 42657761413. The reversal of 42657761387 is 78316775624.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42657761387 - 2¹² = 42657757291 is a prime.

It is not a weakly prime, because it can be changed into another prime (42657761347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21328880693 + 21328880694.

It is an arithmetic number, because the mean of its divisors is an integer number (21328880694).

Almost surely, 2^42657761387 is an apocalyptic number.

42657761387 is a deficient number, since it is larger than the sum of its proper divisors (1).

42657761387 is an equidigital number, since it uses as much as digits as its factorization.

42657761387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11854080, while the sum is 56.

The spelling of 42657761387 in words is "forty-two billion, six hundred fifty-seven million, seven hundred sixty-one thousand, three hundred eighty-seven".