19948725577 has 4 divisors (see below), whose sum is σ = 21762246096. Its totient is φ = 18135205060.

The previous prime is 19948725571. The next prime is 19948725611. The reversal of 19948725577 is 77552784991.

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 19948725577 - 2²⁷ = 19814507849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19948725571) 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, 906760243 + ... + 906760264.

It is an arithmetic number, because the mean of its divisors is an integer number (5440561524).

Almost surely, 2^19948725577 is an apocalyptic number.

It is an amenable number.

19948725577 is a deficient number, since it is larger than the sum of its proper divisors (1813520519).

19948725577 is a wasteful number, since it uses less digits than its factorization.

19948725577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813520518.

The product of its digits is 44452800, while the sum is 64.

The spelling of 19948725577 in words is "nineteen billion, nine hundred forty-eight million, seven hundred twenty-five thousand, five hundred seventy-seven".