157285720491 has 8 divisors (see below), whose sum is σ = 209716329360. Its totient is φ = 104856129312.

The previous prime is 157285720483. The next prime is 157285720507. The reversal of 157285720491 is 194027582751.

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 157285720491 - 2³ = 157285720483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157285720411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247861 + ... + 613193.

It is an arithmetic number, because the mean of its divisors is an integer number (26214541170).

Almost surely, 2^157285720491 is an apocalyptic number.

157285720491 is a deficient number, since it is larger than the sum of its proper divisors (52430608869).

157285720491 is a wasteful number, since it uses less digits than its factorization.

157285720491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508845.

The product of its (nonzero) digits is 1411200, while the sum is 51.

The spelling of 157285720491 in words is "one hundred fifty-seven billion, two hundred eighty-five million, seven hundred twenty thousand, four hundred ninety-one".