19541254770649 has 4 divisors (see below), whose sum is σ = 19541322748980. Its totient is φ = 19541186792320.

The previous prime is 19541254770619. The next prime is 19541254770691. The reversal of 19541254770649 is 94607745214591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11082027945024 + 8459226825625 = 3328968^2 + 2908475^2 .

It is a cyclic number.

It is not a de Polignac number, because 19541254770649 - 2¹⁵ = 19541254737881 is a prime.

It is a super-2 number, since 2×19541254770649² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19541254770619) 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, 33556132 + ... + 34133509.

It is an arithmetic number, because the mean of its divisors is an integer number (4885330687245).

Almost surely, 2^{19541254770649} is an apocalyptic number.

It is an amenable number.

19541254770649 is a deficient number, since it is larger than the sum of its proper divisors (67978331).

19541254770649 is an equidigital number, since it uses as much as digits as its factorization.

19541254770649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67978330.

The product of its (nonzero) digits is 76204800, while the sum is 64.

The spelling of 19541254770649 in words is "nineteen trillion, five hundred forty-one billion, two hundred fifty-four million, seven hundred seventy thousand, six hundred forty-nine".