20416991501 has 2 divisors, whose sum is σ = 20416991502. Its totient is φ = 20416991500.

The previous prime is 20416991489. The next prime is 20416991513. The reversal of 20416991501 is 10519961402.

It is a balanced prime because it is at equal distance from previous prime (20416991489) and next prime (20416991513).

It can be written as a sum of positive squares in only one way, i.e., 17835335401 + 2581656100 = 133549^2 + 50810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20416991501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20416991801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208495750 + 10208495751.

It is an arithmetic number, because the mean of its divisors is an integer number (10208495751).

Almost surely, 2^20416991501 is an apocalyptic number.

It is an amenable number.

20416991501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20416991501 is an equidigital number, since it uses as much as digits as its factorization.

20416991501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 20416991501 in words is "twenty billion, four hundred sixteen million, nine hundred ninety-one thousand, five hundred one".