16215659501 has 2 divisors, whose sum is σ = 16215659502. Its totient is φ = 16215659500.

The previous prime is 16215659483. The next prime is 16215659539. The reversal of 16215659501 is 10595651261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13415662276 + 2799997225 = 115826^2 + 52915^2 .

It is a cyclic number.

It is not a de Polignac number, because 16215659501 - 2¹⁰ = 16215658477 is a prime.

It is a super-2 number, since 2×16215659501² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16215659561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8107829750 + 8107829751.

It is an arithmetic number, because the mean of its divisors is an integer number (8107829751).

Almost surely, 2^16215659501 is an apocalyptic number.

It is an amenable number.

16215659501 is a deficient number, since it is larger than the sum of its proper divisors (1).

16215659501 is an equidigital number, since it uses as much as digits as its factorization.

16215659501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 41.

The spelling of 16215659501 in words is "sixteen billion, two hundred fifteen million, six hundred fifty-nine thousand, five hundred one".