196661520 has 400 divisors, whose sum is σ = 777807360. Its totient is φ = 45619200.

The previous prime is 196661513. The next prime is 196661527. The reversal of 196661520 is 25166691.

It is an interprime number because it is at equal distance from previous prime (196661513) and next prime (196661527).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (196661527) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2209636 + ... + 2209724.

Almost surely, 2^196661520 is an apocalyptic number.

196661520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 196661520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388903680).

196661520 is an abundant number, since it is smaller than the sum of its proper divisors (581145840).

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

196661520 is a wasteful number, since it uses less digits than its factorization.

196661520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 196661520 is about 14023.6058130568. The cubic root of 196661520 is about 581.5313476658.

The spelling of 196661520 in words is "one hundred ninety-six million, six hundred sixty-one thousand, five hundred twenty".