16520221702 has 4 divisors (see below), whose sum is σ = 24780332556. Its totient is φ = 8260110850.

The previous prime is 16520221673. The next prime is 16520221787. The reversal of 16520221702 is 20712202561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20712202561 = 4639 ⋅4464799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4130055424 + ... + 4130055427.

It is an arithmetic number, because the mean of its divisors is an integer number (6195083139).

Almost surely, 2^16520221702 is an apocalyptic number.

16520221702 is a deficient number, since it is larger than the sum of its proper divisors (8260110854).

16520221702 is an equidigital number, since it uses as much as digits as its factorization.

16520221702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8260110853.

The product of its (nonzero) digits is 3360, while the sum is 28.

The spelling of 16520221702 in words is "sixteen billion, five hundred twenty million, two hundred twenty-one thousand, seven hundred two".