19777400457 has 4 divisors (see below), whose sum is σ = 26369867280. Its totient is φ = 13184933636.

The previous prime is 19777400417. The next prime is 19777400473. The reversal of 19777400457 is 75400477791.

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 19777400457 - 2¹⁸ = 19777138313 is a prime.

It is a super-2 number, since 2×19777400457² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19777400417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3296233407 + ... + 3296233412.

It is an arithmetic number, because the mean of its divisors is an integer number (6592466820).

Almost surely, 2^19777400457 is an apocalyptic number.

It is an amenable number.

19777400457 is a deficient number, since it is larger than the sum of its proper divisors (6592466823).

19777400457 is an equidigital number, since it uses as much as digits as its factorization.

19777400457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6592466822.

The product of its (nonzero) digits is 1728720, while the sum is 51.

The spelling of 19777400457 in words is "nineteen billion, seven hundred seventy-seven million, four hundred thousand, four hundred fifty-seven".