157491226791 has 24 divisors (see below), whose sum is σ = 233662067184. Its totient is φ = 102144913920.

The previous prime is 157491226771. The next prime is 157491226817. The reversal of 157491226791 is 197622194751.

157491226791 is a `hidden beast` number, since 1 + 5 + 7 + 491 + 2 + 2 + 67 + 91 = 666.

157491226791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-157491226791 is a prime.

It is a super-2 number, since 2×157491226791² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157491226741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3698775 + ... + 3741111.

It is an arithmetic number, because the mean of its divisors is an integer number (9735919466).

Almost surely, 2^157491226791 is an apocalyptic number.

157491226791 is a deficient number, since it is larger than the sum of its proper divisors (76170840393).

157491226791 is a wasteful number, since it uses less digits than its factorization.

157491226791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53551 (or 53548 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 157491226791 in words is "one hundred fifty-seven billion, four hundred ninety-one million, two hundred twenty-six thousand, seven hundred ninety-one".