157308781821 has 8 divisors (see below), whose sum is σ = 209984207904. Its totient is φ = 104752938480.

The previous prime is 157308781807. The next prime is 157308781831. The reversal of 157308781821 is 128187803751.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157308781821 - 2⁶ = 157308781757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157308781831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29892615 + ... + 29897876.

It is an arithmetic number, because the mean of its divisors is an integer number (26248025988).

Almost surely, 2^157308781821 is an apocalyptic number.

It is an amenable number.

157308781821 is a deficient number, since it is larger than the sum of its proper divisors (52675426083).

157308781821 is an equidigital number, since it uses as much as digits as its factorization.

157308781821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59791371.

The product of its (nonzero) digits is 752640, while the sum is 51.

The spelling of 157308781821 in words is "one hundred fifty-seven billion, three hundred eight million, seven hundred eighty-one thousand, eight hundred twenty-one".