16500651451491 has 32 divisors (see below), whose sum is σ = 23492068121088. Its totient is φ = 10286221397760.

The previous prime is 16500651451483. The next prime is 16500651451499. The reversal of 16500651451491 is 19415415600561.

It is an interprime number because it is at equal distance from previous prime (16500651451483) and next prime (16500651451499).

It is not a de Polignac number, because 16500651451491 - 2³ = 16500651451483 is a prime.

It is a super-2 number, since 2×16500651451491² (a number of 27 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 16500651451491.

It is not an unprimeable number, because it can be changed into a prime (16500651451499) 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, 26752695 + ... + 27362528.

It is an arithmetic number, because the mean of its divisors is an integer number (734127128784).

Almost surely, 2^{16500651451491} is an apocalyptic number.

16500651451491 is a deficient number, since it is larger than the sum of its proper divisors (6991416669597).

16500651451491 is a wasteful number, since it uses less digits than its factorization.

16500651451491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54115371.

The product of its (nonzero) digits is 648000, while the sum is 48.

The spelling of 16500651451491 in words is "sixteen trillion, five hundred billion, six hundred fifty-one million, four hundred fifty-one thousand, four hundred ninety-one".