216251982501 has 16 divisors (see below), whose sum is σ = 310471444800. Its totient is φ = 133387728128.

The previous prime is 216251982497. The next prime is 216251982581. The reversal of 216251982501 is 105289152612.

It is a cyclic number.

It is not a de Polignac number, because 216251982501 - 2² = 216251982497 is a prime.

It is a super-2 number, since 2×216251982501² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216251982581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35931186 + ... + 35937203.

It is an arithmetic number, because the mean of its divisors is an integer number (19404465300).

Almost surely, 2^216251982501 is an apocalyptic number.

It is an amenable number.

216251982501 is a deficient number, since it is larger than the sum of its proper divisors (94219462299).

216251982501 is a wasteful number, since it uses less digits than its factorization.

216251982501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71868468.

The product of its (nonzero) digits is 86400, while the sum is 42.

The spelling of 216251982501 in words is "two hundred sixteen billion, two hundred fifty-one million, nine hundred eighty-two thousand, five hundred one".