15400109999 has 24 divisors (see below), whose sum is σ = 16234381680. Its totient is φ = 14600355840.

The previous prime is 15400109983. The next prime is 15400110001. The reversal of 15400109999 is 99990100451.

It is a happy number.

It is not a de Polignac number, because 15400109999 - 2⁴ = 15400109983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15400109939) 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, 18576317 + ... + 18577145.

It is an arithmetic number, because the mean of its divisors is an integer number (676432570).

Almost surely, 2^15400109999 is an apocalyptic number.

15400109999 is a deficient number, since it is larger than the sum of its proper divisors (834271681).

15400109999 is an equidigital number, since it uses as much as digits as its factorization.

15400109999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1170 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 47.

The spelling of 15400109999 in words is "fifteen billion, four hundred million, one hundred nine thousand, nine hundred ninety-nine".