19685460816 has 120 divisors (see below), whose sum is σ = 63902181824. Its totient is φ = 5540451840.

The previous prime is 19685460803. The next prime is 19685460829. The reversal of 19685460816 is 61806458691.

19685460816 is a `hidden beast` number, since 1 + 96 + 8 + 546 + 0 + 8 + 1 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (19685460803) and next prime (19685460829).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78205 + ... + 213276.

Almost surely, 2^19685460816 is an apocalyptic number.

19685460816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19685460816 is an abundant number, since it is smaller than the sum of its proper divisors (44216721008).

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

19685460816 is a wasteful number, since it uses less digits than its factorization.

19685460816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291569 (or 291560 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 19685460816 in words is "nineteen billion, six hundred eighty-five million, four hundred sixty thousand, eight hundred sixteen".