16491369961 has 16 divisors (see below), whose sum is σ = 18180759168. Its totient is φ = 14834476800.

The previous prime is 16491369959. The next prime is 16491369967. The reversal of 16491369961 is 16996319461.

It is a happy number.

It is not a de Polignac number, because 16491369961 - 2¹ = 16491369959 is a prime.

It is a super-3 number, since 3×16491369961³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16491369967) 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, 396396 + ... + 436018.

It is an arithmetic number, because the mean of its divisors is an integer number (1136297448).

Almost surely, 2^16491369961 is an apocalyptic number.

16491369961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16491369961 is a deficient number, since it is larger than the sum of its proper divisors (1689389207).

16491369961 is a wasteful number, since it uses less digits than its factorization.

16491369961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40032.

The product of its digits is 1889568, while the sum is 55.

The spelling of 16491369961 in words is "sixteen billion, four hundred ninety-one million, three hundred sixty-nine thousand, nine hundred sixty-one".