42646531023661 has 4 divisors (see below), whose sum is σ = 42701988151900. Its totient is φ = 42591073895424.

The previous prime is 42646531023659. The next prime is 42646531023673. The reversal of 42646531023661 is 16632013564624.

42646531023661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7263294502500 + 35383236521161 = 2695050^2 + 5948381^2 .

It is a cyclic number.

It is not a de Polignac number, because 42646531023661 - 2¹ = 42646531023659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42646531023601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27728562966 + ... + 27728564503.

It is an arithmetic number, because the mean of its divisors is an integer number (10675497037975).

Almost surely, 2^{42646531023661} is an apocalyptic number.

It is an amenable number.

42646531023661 is a deficient number, since it is larger than the sum of its proper divisors (55457128239).

42646531023661 is an equidigital number, since it uses as much as digits as its factorization.

42646531023661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55457128238.

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 42646531023661 in words is "forty-two trillion, six hundred forty-six billion, five hundred thirty-one million, twenty-three thousand, six hundred sixty-one".