17871879749 has 16 divisors (see below), whose sum is σ = 18509977536. Its totient is φ = 17242243200.

The previous prime is 17871879743. The next prime is 17871879757. The reversal of 17871879749 is 94797817871.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17871879749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17871879743) 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, 6542714 + ... + 6545444.

It is an arithmetic number, because the mean of its divisors is an integer number (1156873596).

Almost surely, 2^17871879749 is an apocalyptic number.

It is an amenable number.

17871879749 is a deficient number, since it is larger than the sum of its proper divisors (638097787).

17871879749 is a wasteful number, since it uses less digits than its factorization.

17871879749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196.

The product of its digits is 49787136, while the sum is 68.

The spelling of 17871879749 in words is "seventeen billion, eight hundred seventy-one million, eight hundred seventy-nine thousand, seven hundred forty-nine".