19725905485 has 16 divisors (see below), whose sum is σ = 27809389440. Its totient is φ = 13242565440.

The previous prime is 19725905417. The next prime is 19725905489. The reversal of 19725905485 is 58450952791.

It is not a de Polignac number, because 19725905485 - 2⁹ = 19725904973 is a prime.

It is a super-2 number, since 2×19725905485² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19725905489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13793625 + ... + 13795054.

It is an arithmetic number, because the mean of its divisors is an integer number (1738086840).

Almost surely, 2^19725905485 is an apocalyptic number.

It is an amenable number.

19725905485 is a deficient number, since it is larger than the sum of its proper divisors (8083483955).

19725905485 is a wasteful number, since it uses less digits than its factorization.

19725905485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27588708.

The product of its (nonzero) digits is 4536000, while the sum is 55.

The spelling of 19725905485 in words is "nineteen billion, seven hundred twenty-five million, nine hundred five thousand, four hundred eighty-five".