42552351661 has 4 divisors (see below), whose sum is σ = 42552972000. Its totient is φ = 42551731324.

The previous prime is 42552351637. The next prime is 42552351707. The reversal of 42552351661 is 16615325524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42552351661 - 2⁵ = 42552351629 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 (42552351631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192361 + ... + 349438.

It is an arithmetic number, because the mean of its divisors is an integer number (10638243000).

Almost surely, 2^42552351661 is an apocalyptic number.

It is an amenable number.

42552351661 is a deficient number, since it is larger than the sum of its proper divisors (620339).

42552351661 is an equidigital number, since it uses as much as digits as its factorization.

42552351661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620338.

The product of its digits is 216000, while the sum is 40.

The spelling of 42552351661 in words is "forty-two billion, five hundred fifty-two million, three hundred fifty-one thousand, six hundred sixty-one".