19746408536 has 8 divisors (see below), whose sum is σ = 37024516020. Its totient is φ = 9873204264.

The previous prime is 19746408511. The next prime is 19746408587. The reversal of 19746408536 is 63580464791.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×19746408536² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1234150526 + ... + 1234150541.

Almost surely, 2^19746408536 is an apocalyptic number.

It is an amenable number.

19746408536 is a deficient number, since it is larger than the sum of its proper divisors (17278107484).

19746408536 is a wasteful number, since it uses less digits than its factorization.

19746408536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468301073 (or 2468301069 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 19746408536 in words is "nineteen billion, seven hundred forty-six million, four hundred eight thousand, five hundred thirty-six".