9739956681 has 192 divisors, whose sum is σ = 19180994560. Its totient is φ = 4618944000.

The previous prime is 9739956623. The next prime is 9739956683. The reversal of 9739956681 is 1866599379.

It is not a de Polignac number, because 9739956681 - 2¹⁵ = 9739923913 is a prime.

It is a super-2 number, since 2×9739956681² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (9739956683) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 29425686 + ... + 29426016.

Almost surely, 2^9739956681 is an apocalyptic number.

9739956681 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

9739956681 is a deficient number, since it is larger than the sum of its proper divisors (9441037879).

9739956681 is a wasteful number, since it uses less digits than its factorization.

9739956681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 465 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The square root of 9739956681 is about 98691.2188646994. The cubic root of 9739956681 is about 2135.5955559470.

The spelling of 9739956681 in words is "nine billion, seven hundred thirty-nine million, nine hundred fifty-six thousand, six hundred eighty-one".