100156487838 has 64 divisors (see below), whose sum is σ = 228552371712. Its totient is φ = 28963630080.

The previous prime is 100156487807. The next prime is 100156487839. The reversal of 100156487838 is 838784651001.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100156487839) 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, 581106 + ... + 733482.

It is an arithmetic number, because the mean of its divisors is an integer number (3571130808).

Almost surely, 2^100156487838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100156487838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114276185856).

100156487838 is an abundant number, since it is smaller than the sum of its proper divisors (128395883874).

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

100156487838 is a wasteful number, since it uses less digits than its factorization.

100156487838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152849.

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 100156487838 in words is "one hundred billion, one hundred fifty-six million, four hundred eighty-seven thousand, eight hundred thirty-eight".