20161521707 has 2 divisors, whose sum is σ = 20161521708. Its totient is φ = 20161521706.

The previous prime is 20161521703. The next prime is 20161521733. The reversal of 20161521707 is 70712516102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20161521707 - 2² = 20161521703 is a prime.

It is not a weakly prime, because it can be changed into another prime (20161521703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080760853 + 10080760854.

It is an arithmetic number, because the mean of its divisors is an integer number (10080760854).

Almost surely, 2^20161521707 is an apocalyptic number.

20161521707 is a deficient number, since it is larger than the sum of its proper divisors (1).

20161521707 is an equidigital number, since it uses as much as digits as its factorization.

20161521707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 32.

It can be divided in two parts, 201615 and 21707, that added together give a palindrome (223322).

The spelling of 20161521707 in words is "twenty billion, one hundred sixty-one million, five hundred twenty-one thousand, seven hundred seven".