43206639918 has 128 divisors (see below), whose sum is σ = 102047662080. Its totient is φ = 12068904960.

The previous prime is 43206639907. The next prime is 43206639997. The reversal of 43206639918 is 81993660234.

It is a super-2 number, since 2×43206639918² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13851163 + ... + 13854281.

It is an arithmetic number, because the mean of its divisors is an integer number (797247360).

Almost surely, 2^43206639918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43206639918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51023831040).

43206639918 is an abundant number, since it is smaller than the sum of its proper divisors (58841022162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43206639918 is a wasteful number, since it uses less digits than its factorization.

43206639918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522.

The product of its (nonzero) digits is 1679616, while the sum is 51.

The spelling of 43206639918 in words is "forty-three billion, two hundred six million, six hundred thirty-nine thousand, nine hundred eighteen".