155415315100 has 72 divisors (see below), whose sum is σ = 343776309408. Its totient is φ = 60972441600.

The previous prime is 155415315073. The next prime is 155415315109. The reversal of 155415315100 is 1513514551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155415315109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1313592 + ... + 1427008.

It is an arithmetic number, because the mean of its divisors is an integer number (4774670964).

Almost surely, 2^155415315100 is an apocalyptic number.

155415315100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155415315100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171888154704).

155415315100 is an abundant number, since it is smaller than the sum of its proper divisors (188360994308).

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

155415315100 is a wasteful number, since it uses less digits than its factorization.

155415315100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113695 (or 113688 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

Adding to 155415315100 its reverse (1513514551), we get a palindrome (156928829651).

The spelling of 155415315100 in words is "one hundred fifty-five billion, four hundred fifteen million, three hundred fifteen thousand, one hundred".