42020643257 has 16 divisors (see below), whose sum is σ = 45444139200. Its totient is φ = 38719114560.

The previous prime is 42020643229. The next prime is 42020643277. The reversal of 42020643257 is 75234602024.

It is a cyclic number.

It is not a de Polignac number, because 42020643257 - 2¹² = 42020639161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42020643227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2281907 + ... + 2300247.

It is an arithmetic number, because the mean of its divisors is an integer number (2840258700).

Almost surely, 2^42020643257 is an apocalyptic number.

It is an amenable number.

42020643257 is a deficient number, since it is larger than the sum of its proper divisors (3423495943).

42020643257 is a wasteful number, since it uses less digits than its factorization.

42020643257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21656.

The product of its (nonzero) digits is 80640, while the sum is 35.

The spelling of 42020643257 in words is "forty-two billion, twenty million, six hundred forty-three thousand, two hundred fifty-seven".