15550919999 has 4 divisors (see below), whose sum is σ = 15615446880. Its totient is φ = 15486393120.

The previous prime is 15550919963. The next prime is 15550920001. The reversal of 15550919999 is 99991905551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15550919999 is a prime.

It is a super-2 number, since 2×15550919999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15550919959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32263079 + ... + 32263560.

It is an arithmetic number, because the mean of its divisors is an integer number (3903861720).

Almost surely, 2^15550919999 is an apocalyptic number.

15550919999 is a deficient number, since it is larger than the sum of its proper divisors (64526881).

15550919999 is an equidigital number, since it uses as much as digits as its factorization.

15550919999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64526880.

The product of its (nonzero) digits is 7381125, while the sum is 62.

The spelling of 15550919999 in words is "fifteen billion, five hundred fifty million, nine hundred nineteen thousand, nine hundred ninety-nine".