16461637501 has 2 divisors, whose sum is σ = 16461637502. Its totient is φ = 16461637500.

The previous prime is 16461637499. The next prime is 16461637519. The reversal of 16461637501 is 10573616461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16444215225 + 17422276 = 128235^2 + 4174^2 .

It is a cyclic number.

It is not a de Polignac number, because 16461637501 - 2¹ = 16461637499 is a prime.

Together with 16461637499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16461637001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8230818750 + 8230818751.

It is an arithmetic number, because the mean of its divisors is an integer number (8230818751).

Almost surely, 2^16461637501 is an apocalyptic number.

It is an amenable number.

16461637501 is a deficient number, since it is larger than the sum of its proper divisors (1).

16461637501 is an equidigital number, since it uses as much as digits as its factorization.

16461637501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 16461637501 in words is "sixteen billion, four hundred sixty-one million, six hundred thirty-seven thousand, five hundred one".