16661671530 has 64 divisors (see below), whose sum is σ = 46344296448. Its totient is φ = 3754739520.

The previous prime is 16661671529. The next prime is 16661671531. The reversal of 16661671530 is 3517616661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16661671529) and next prime (16661671531).

It is a super-2 number, since 2×16661671530² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (16661671531) 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 31 ways as a sum of consecutive naturals, for example, 543832 + ... + 573651.

It is an arithmetic number, because the mean of its divisors is an integer number (724129632).

Almost surely, 2^16661671530 is an apocalyptic number.

16661671530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16661671530 is an abundant number, since it is smaller than the sum of its proper divisors (29682624918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16661671530 is a wasteful number, since it uses less digits than its factorization.

16661671530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117571.

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 16661671530 in words is "sixteen billion, six hundred sixty-one million, six hundred seventy-one thousand, five hundred thirty".