157663853821 has 4 divisors (see below), whose sum is σ = 157713080832. Its totient is φ = 157614626812.

The previous prime is 157663853813. The next prime is 157663853857. The reversal of 157663853821 is 128358366751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157663853821 - 2³ = 157663853813 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 (157663853861) 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, 24608701 + ... + 24615106.

It is an arithmetic number, because the mean of its divisors is an integer number (39428270208).

Almost surely, 2^157663853821 is an apocalyptic number.

It is an amenable number.

157663853821 is a deficient number, since it is larger than the sum of its proper divisors (49227011).

157663853821 is an equidigital number, since it uses as much as digits as its factorization.

157663853821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49227010.

The product of its digits is 7257600, while the sum is 55.

The spelling of 157663853821 in words is "one hundred fifty-seven billion, six hundred sixty-three million, eight hundred fifty-three thousand, eight hundred twenty-one".