42100402661 has 8 divisors (see below), whose sum is σ = 42675213504. Its totient is φ = 41527200960.

The previous prime is 42100402651. The next prime is 42100402697. The reversal of 42100402661 is 16620400124.

42100402661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42100402661 - 2¹⁸ = 42100140517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42100402661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42100402621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349556 + ... + 454301.

It is an arithmetic number, because the mean of its divisors is an integer number (5334401688).

Almost surely, 2^42100402661 is an apocalyptic number.

It is an amenable number.

42100402661 is a deficient number, since it is larger than the sum of its proper divisors (574810843).

42100402661 is an equidigital number, since it uses as much as digits as its factorization.

42100402661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804571.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 42100402661 its reverse (16620400124), we get a palindrome (58720802785).

The spelling of 42100402661 in words is "forty-two billion, one hundred million, four hundred two thousand, six hundred sixty-one".