262191421649 has 4 divisors (see below), whose sum is σ = 264736969536. Its totient is φ = 259645873764.

The previous prime is 262191421637. The next prime is 262191421663. The reversal of 262191421649 is 946124191262.

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 262191421649 - 2²⁰ = 262190373073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (262191421619) 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, 1272773789 + ... + 1272773994.

It is an arithmetic number, because the mean of its divisors is an integer number (66184242384).

Almost surely, 2^262191421649 is an apocalyptic number.

It is an amenable number.

262191421649 is a deficient number, since it is larger than the sum of its proper divisors (2545547887).

262191421649 is a wasteful number, since it uses less digits than its factorization.

262191421649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545547886.

The product of its digits is 373248, while the sum is 47.

The spelling of 262191421649 in words is "two hundred sixty-two billion, one hundred ninety-one million, four hundred twenty-one thousand, six hundred forty-nine".