15854349823 has 4 divisors (see below), whose sum is σ = 17073915208. Its totient is φ = 14634784440.

The previous prime is 15854349803. The next prime is 15854349839. The reversal of 15854349823 is 32894345851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32894345851 = 107 ⋅307423793.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15854349823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15854349803) 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, 609782673 + ... + 609782698.

It is an arithmetic number, because the mean of its divisors is an integer number (4268478802).

Almost surely, 2^15854349823 is an apocalyptic number.

15854349823 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

15854349823 is a deficient number, since it is larger than the sum of its proper divisors (1219565385).

15854349823 is a wasteful number, since it uses less digits than its factorization.

15854349823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219565384.

The product of its digits is 4147200, while the sum is 52.

The spelling of 15854349823 in words is "fifteen billion, eight hundred fifty-four million, three hundred forty-nine thousand, eight hundred twenty-three".