15208778142 has 24 divisors (see below), whose sum is σ = 32955044616. Its totient is φ = 5069178576.

The previous prime is 15208778131. The next prime is 15208778149. The reversal of 15208778142 is 24187780251.

15208778142 is a `hidden beast` number, since 1 + 520 + 8 + 7 + 7 + 81 + 42 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15208778149) 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, 259768 + ... + 312884.

It is an arithmetic number, because the mean of its divisors is an integer number (1373126859).

Almost surely, 2^15208778142 is an apocalyptic number.

15208778142 is an abundant number, since it is smaller than the sum of its proper divisors (17746266474).

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

15208778142 is a wasteful number, since it uses less digits than its factorization.

15208778142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69032 (or 69029 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The spelling of 15208778142 in words is "fifteen billion, two hundred eight million, seven hundred seventy-eight thousand, one hundred forty-two".