19771564485 has 32 divisors (see below), whose sum is σ = 33503742720. Its totient is φ = 9922065408.

The previous prime is 19771564457. The next prime is 19771564487. The reversal of 19771564485 is 58446517791.

It is not a de Polignac number, because 19771564485 - 2¹³ = 19771556293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19771564487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1426971 + ... + 1440759.

It is an arithmetic number, because the mean of its divisors is an integer number (1046991960).

Almost surely, 2^19771564485 is an apocalyptic number.

19771564485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19771564485 is a deficient number, since it is larger than the sum of its proper divisors (13732178235).

19771564485 is a wasteful number, since it uses less digits than its factorization.

19771564485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19437.

The product of its digits is 8467200, while the sum is 57.

The spelling of 19771564485 in words is "nineteen billion, seven hundred seventy-one million, five hundred sixty-four thousand, four hundred eighty-five".