15781868853 has 32 divisors (see below), whose sum is σ = 22360707072. Its totient is φ = 9880147200.

The previous prime is 15781868743. The next prime is 15781868881. The reversal of 15781868853 is 35886818751.

It is not a de Polignac number, because 15781868853 - 2³⁰ = 14708127029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15781868153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1173976 + ... + 1187342.

It is an arithmetic number, because the mean of its divisors is an integer number (698772096).

Almost surely, 2^15781868853 is an apocalyptic number.

It is an amenable number.

15781868853 is a deficient number, since it is larger than the sum of its proper divisors (6578838219).

15781868853 is a wasteful number, since it uses less digits than its factorization.

15781868853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13705.

The product of its digits is 12902400, while the sum is 60.

The spelling of 15781868853 in words is "fifteen billion, seven hundred eighty-one million, eight hundred sixty-eight thousand, eight hundred fifty-three".