16763925981 has 32 divisors (see below), whose sum is σ = 26940791808. Its totient is φ = 9146551040.

The previous prime is 16763925979. The next prime is 16763926007. The reversal of 16763925981 is 18952936761.

It is not a de Polignac number, because 16763925981 - 2¹ = 16763925979 is a prime.

It is a super-2 number, since 2×16763925981² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16763925911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636711 + ... + 662516.

It is an arithmetic number, because the mean of its divisors is an integer number (841899744).

Almost surely, 2^16763925981 is an apocalyptic number.

16763925981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16763925981 is a deficient number, since it is larger than the sum of its proper divisors (10176865827).

16763925981 is a wasteful number, since it uses less digits than its factorization.

16763925981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299281.

The product of its digits is 4898880, while the sum is 57.

The spelling of 16763925981 in words is "sixteen billion, seven hundred sixty-three million, nine hundred twenty-five thousand, nine hundred eighty-one".