42646779997 has 2 divisors, whose sum is σ = 42646779998. Its totient is φ = 42646779996.

The previous prime is 42646779979. The next prime is 42646780039. The reversal of 42646779997 is 79997764624.

Together with previous prime (42646779979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35696056356 + 6950723641 = 188934^2 + 83371^2 .

It is a cyclic number.

It is not a de Polignac number, because 42646779997 - 2⁷ = 42646779869 is a prime.

It is a super-2 number, since 2×42646779997² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42646779907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21323389998 + 21323389999.

It is an arithmetic number, because the mean of its divisors is an integer number (21323389999).

Almost surely, 2^42646779997 is an apocalyptic number.

It is an amenable number.

42646779997 is a deficient number, since it is larger than the sum of its proper divisors (1).

42646779997 is an equidigital number, since it uses as much as digits as its factorization.

42646779997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288054144, while the sum is 70.

The spelling of 42646779997 in words is "forty-two billion, six hundred forty-six million, seven hundred seventy-nine thousand, nine hundred ninety-seven".