16991002712501 has 2 divisors, whose sum is σ = 16991002712502. Its totient is φ = 16991002712500.

The previous prime is 16991002712471. The next prime is 16991002712513. The reversal of 16991002712501 is 10521720019961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12556604860900 + 4434397851601 = 3543530^2 + 2105801^2 .

It is a cyclic number.

It is not a de Polignac number, because 16991002712501 - 2²⁶ = 16990935603637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16991002712561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8495501356250 + 8495501356251.

It is an arithmetic number, because the mean of its divisors is an integer number (8495501356251).

Almost surely, 2^{16991002712501} is an apocalyptic number.

It is an amenable number.

16991002712501 is a deficient number, since it is larger than the sum of its proper divisors (1).

16991002712501 is an equidigital number, since it uses as much as digits as its factorization.

16991002712501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 44.

The spelling of 16991002712501 in words is "sixteen trillion, nine hundred ninety-one billion, two million, seven hundred twelve thousand, five hundred one".