19925661494 has 16 divisors (see below), whose sum is σ = 32476462080. Its totient is φ = 9134003880.

The previous prime is 19925661439. The next prime is 19925661499. The reversal of 19925661494 is 49416652991.

It is a super-3 number, since 3×19925661494³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19925661499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8456234 + ... + 8458589.

It is an arithmetic number, because the mean of its divisors is an integer number (2029778880).

Almost surely, 2^19925661494 is an apocalyptic number.

19925661494 is a deficient number, since it is larger than the sum of its proper divisors (12550800586).

19925661494 is a wasteful number, since it uses less digits than its factorization.

19925661494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16914875.

The product of its digits is 4199040, while the sum is 56.

The spelling of 19925661494 in words is "nineteen billion, nine hundred twenty-five million, six hundred sixty-one thousand, four hundred ninety-four".