19368432077 has 4 divisors (see below), whose sum is σ = 19376117436. Its totient is φ = 19360746720.

The previous prime is 19368432071. The next prime is 19368432107. The reversal of 19368432077 is 77023486391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77023486391 = 1171 ⋅65775821.

It can be written as a sum of positive squares in 2 ways, for example, as 8102520196 + 11265911881 = 90014^2 + 106141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19368432077 is a prime.

It is a super-3 number, since 3×19368432077³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19368432071) 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, 3838898 + ... + 3843939.

It is an arithmetic number, because the mean of its divisors is an integer number (4844029359).

Almost surely, 2^19368432077 is an apocalyptic number.

It is an amenable number.

19368432077 is a deficient number, since it is larger than the sum of its proper divisors (7685359).

19368432077 is an equidigital number, since it uses as much as digits as its factorization.

19368432077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7685358.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 19368432077 in words is "nineteen billion, three hundred sixty-eight million, four hundred thirty-two thousand, seventy-seven".