16661553351 has 8 divisors (see below), whose sum is σ = 22216752000. Its totient is φ = 11107028472.

The previous prime is 16661553329. The next prime is 16661553371. The reversal of 16661553351 is 15335516661.

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

It is not a de Polignac number, because 16661553351 - 2¹⁴ = 16661536967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661553371) 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, 107601 + ... + 211898.

It is an arithmetic number, because the mean of its divisors is an integer number (2777094000).

Almost surely, 2^16661553351 is an apocalyptic number.

16661553351 is a deficient number, since it is larger than the sum of its proper divisors (5555198649).

16661553351 is a wasteful number, since it uses less digits than its factorization.

16661553351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336885.

The product of its digits is 243000, while the sum is 42.

The spelling of 16661553351 in words is "sixteen billion, six hundred sixty-one million, five hundred fifty-three thousand, three hundred fifty-one".