15505041400 has 48 divisors (see below), whose sum is σ = 37292311800. Its totient is φ = 5988151680.

The previous prime is 15505041389. The next prime is 15505041407. The reversal of 15505041400 is 414050551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15505041407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1330842 + ... + 1342441.

Almost surely, 2^15505041400 is an apocalyptic number.

15505041400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15505041400 is an abundant number, since it is smaller than the sum of its proper divisors (21787270400).

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

15505041400 is a wasteful number, since it uses less digits than its factorization.

15505041400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673328 (or 2673319 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 15505041400 its reverse (414050551), we get a palindrome (15919091951).

The spelling of 15505041400 in words is "fifteen billion, five hundred five million, forty-one thousand, four hundred".