16421161631 has 16 divisors (see below), whose sum is σ = 19249750080. Its totient is φ = 13717486080.

The previous prime is 16421161583. The next prime is 16421161661. The reversal of 16421161631 is 13616112461.

It is a cyclic number.

It is not a de Polignac number, because 16421161631 - 2¹⁸ = 16420899487 is a prime.

It is a super-2 number, since 2×16421161631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421161661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129866 + ... + 222951.

It is an arithmetic number, because the mean of its divisors is an integer number (1203109380).

Almost surely, 2^16421161631 is an apocalyptic number.

16421161631 is a deficient number, since it is larger than the sum of its proper divisors (2828588449).

16421161631 is a wasteful number, since it uses less digits than its factorization.

16421161631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352994.

The product of its digits is 5184, while the sum is 32.

The spelling of 16421161631 in words is "sixteen billion, four hundred twenty-one million, one hundred sixty-one thousand, six hundred thirty-one".