16126561215 has 32 divisors (see below), whose sum is σ = 29073254400. Its totient is φ = 8479689120.

The previous prime is 16126561211. The next prime is 16126561271. The reversal of 16126561215 is 51216562161.

16126561215 is a `hidden beast` number, since 1 + 6 + 1 + 26 + 5 + 612 + 15 = 666.

It is not a de Polignac number, because 16126561215 - 2² = 16126561211 is a prime.

It is a super-2 number, since 2×16126561215² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16126561215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16126561211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 831655 + ... + 850824.

It is an arithmetic number, because the mean of its divisors is an integer number (908539200).

Almost surely, 2^16126561215 is an apocalyptic number.

16126561215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16126561215 is a deficient number, since it is larger than the sum of its proper divisors (12946693185).

16126561215 is a wasteful number, since it uses less digits than its factorization.

16126561215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682564 (or 1682558 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 16126561215 in words is "sixteen billion, one hundred twenty-six million, five hundred sixty-one thousand, two hundred fifteen".