17639945961 has 16 divisors (see below), whose sum is σ = 25922624448. Its totient is φ = 10580659200.

The previous prime is 17639945959. The next prime is 17639945963. The reversal of 17639945961 is 16954993671.

It is an interprime number because it is at equal distance from previous prime (17639945959) and next prime (17639945963).

It is not a de Polignac number, because 17639945961 - 2¹ = 17639945959 is a prime.

It is a super-2 number, since 2×17639945961² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 17639945895 and 17639945904.

It is not an unprimeable number, because it can be changed into a prime (17639945963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2752180 + ... + 2758581.

It is an arithmetic number, because the mean of its divisors is an integer number (1620164028).

Almost surely, 2^17639945961 is an apocalyptic number.

17639945961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

17639945961 is a deficient number, since it is larger than the sum of its proper divisors (8282678487).

17639945961 is a wasteful number, since it uses less digits than its factorization.

17639945961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5510872.

The product of its digits is 11022480, while the sum is 60.

The spelling of 17639945961 in words is "seventeen billion, six hundred thirty-nine million, nine hundred forty-five thousand, nine hundred sixty-one".