157721496871 has 2 divisors, whose sum is σ = 157721496872. Its totient is φ = 157721496870.

The previous prime is 157721496839. The next prime is 157721496941. The reversal of 157721496871 is 178694127751.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157721496871 - 2⁵ = 157721496839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157721496571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78860748435 + 78860748436.

It is an arithmetic number, because the mean of its divisors is an integer number (78860748436).

Almost surely, 2^157721496871 is an apocalyptic number.

157721496871 is a deficient number, since it is larger than the sum of its proper divisors (1).

157721496871 is an equidigital number, since it uses as much as digits as its factorization.

157721496871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 58.

The spelling of 157721496871 in words is "one hundred fifty-seven billion, seven hundred twenty-one million, four hundred ninety-six thousand, eight hundred seventy-one".