42920689457 has 2 divisors, whose sum is σ = 42920689458. Its totient is φ = 42920689456.

The previous prime is 42920689433. The next prime is 42920689477. The reversal of 42920689457 is 75498602924.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30857840896 + 12062848561 = 175664^2 + 109831^2 .

It is a cyclic number.

It is not a de Polignac number, because 42920689457 - 2¹² = 42920685361 is a prime.

It is not a weakly prime, because it can be changed into another prime (42920689477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21460344728 + 21460344729.

It is an arithmetic number, because the mean of its divisors is an integer number (21460344729).

Almost surely, 2^42920689457 is an apocalyptic number.

It is an amenable number.

42920689457 is a deficient number, since it is larger than the sum of its proper divisors (1).

42920689457 is an equidigital number, since it uses as much as digits as its factorization.

42920689457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 42920689457 in words is "forty-two billion, nine hundred twenty million, six hundred eighty-nine thousand, four hundred fifty-seven".