16520251261642 has 16 divisors (see below), whose sum is σ = 24967970999712. Its totient is φ = 8197738844400.

The previous prime is 16520251261637. The next prime is 16520251261649. The reversal of 16520251261642 is 24616215202561.

It is a happy number.

16520251261642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (16520251261649) 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, 35916708 + ... + 36373759.

It is an arithmetic number, because the mean of its divisors is an integer number (1560498187482).

Almost surely, 2^{16520251261642} is an apocalyptic number.

16520251261642 is a deficient number, since it is larger than the sum of its proper divisors (8447719738070).

16520251261642 is a wasteful number, since it uses less digits than its factorization.

16520251261642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72291333.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 16520251261642 in words is "sixteen trillion, five hundred twenty billion, two hundred fifty-one million, two hundred sixty-one thousand, six hundred forty-two".