16464635561 has 8 divisors (see below), whose sum is σ = 17988934464. Its totient is φ = 14944922320.

The previous prime is 16464635519. The next prime is 16464635563. The reversal of 16464635561 is 16553646461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16464635561 - 2¹⁴ = 16464619177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16464635563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1138901 + ... + 1153266.

It is an arithmetic number, because the mean of its divisors is an integer number (2248616808).

Almost surely, 2^16464635561 is an apocalyptic number.

16464635561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16464635561 is a deficient number, since it is larger than the sum of its proper divisors (1524298903).

16464635561 is a wasteful number, since it uses less digits than its factorization.

16464635561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292831.

The product of its digits is 1555200, while the sum is 47.

The spelling of 16464635561 in words is "sixteen billion, four hundred sixty-four million, six hundred thirty-five thousand, five hundred sixty-one".