196350021581 has 4 divisors (see below), whose sum is σ = 224400024672. Its totient is φ = 168300018492.

The previous prime is 196350021541. The next prime is 196350021587. The reversal of 196350021581 is 185120053691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 196350021581 - 2²⁶ = 196282912717 is a prime.

It is a super-2 number, since 2×196350021581² (a number of 23 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 (196350021587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14025001535 + ... + 14025001548.

It is an arithmetic number, because the mean of its divisors is an integer number (56100006168).

Almost surely, 2^196350021581 is an apocalyptic number.

It is an amenable number.

196350021581 is a deficient number, since it is larger than the sum of its proper divisors (28050003091).

196350021581 is an equidigital number, since it uses as much as digits as its factorization.

196350021581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28050003090.

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 196350021581 in words is "one hundred ninety-six billion, three hundred fifty million, twenty-one thousand, five hundred eighty-one".