19649013654 has 16 divisors (see below), whose sum is σ = 39517571520. Its totient is φ = 6513080520.

The previous prime is 19649013653. The next prime is 19649013677. The reversal of 19649013654 is 45631094691.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649013653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9146512 + ... + 9148659.

It is an arithmetic number, because the mean of its divisors is an integer number (2469848220).

Almost surely, 2^19649013654 is an apocalyptic number.

19649013654 is an abundant number, since it is smaller than the sum of its proper divisors (19868557866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19649013654 is a wasteful number, since it uses less digits than its factorization.

19649013654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18295355.

The product of its (nonzero) digits is 699840, while the sum is 48.

The spelling of 19649013654 in words is "nineteen billion, six hundred forty-nine million, thirteen thousand, six hundred fifty-four".