19708149664 has 36 divisors (see below), whose sum is σ = 45135185634. Its totient is φ = 8446349184.

The previous prime is 19708149619. The next prime is 19708149667. The reversal of 19708149664 is 46694180791.

It can be written as a sum of positive squares in only one way, i.e., 11113376400 + 8594773264 = 105420^2 + 92708^2 .

It is a super-2 number, since 2×19708149664² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19708149667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6282919 + ... + 6286054.

Almost surely, 2^19708149664 is an apocalyptic number.

19708149664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19708149664 is an abundant number, since it is smaller than the sum of its proper divisors (25427035970).

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

19708149664 is a wasteful number, since it uses less digits than its factorization.

19708149664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12568997 (or 12568982 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 19708149664 in words is "nineteen billion, seven hundred eight million, one hundred forty-nine thousand, six hundred sixty-four".