71557153231 has 4 divisors (see below), whose sum is σ = 71651681272. Its totient is φ = 71462625192.

The previous prime is 71557153223. The next prime is 71557153237. The reversal of 71557153231 is 13235175517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13235175517 = 157 ⋅84300481.

It is a cyclic number.

It is not a de Polignac number, because 71557153231 - 2³ = 71557153223 is a prime.

It is a super-2 number, since 2×71557153231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71557153237) 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, 47262885 + ... + 47264398.

It is an arithmetic number, because the mean of its divisors is an integer number (17912920318).

Almost surely, 2^71557153231 is an apocalyptic number.

71557153231 is a deficient number, since it is larger than the sum of its proper divisors (94528041).

71557153231 is an equidigital number, since it uses as much as digits as its factorization.

71557153231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94528040.

The product of its digits is 110250, while the sum is 40.

The spelling of 71557153231 in words is "seventy-one billion, five hundred fifty-seven million, one hundred fifty-three thousand, two hundred thirty-one".