71585857149 has 4 divisors (see below), whose sum is σ = 95447809536. Its totient is φ = 47723904764.

The previous prime is 71585857103. The next prime is 71585857153. The reversal of 71585857149 is 94175858517.

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 71585857149 - 2²⁰ = 71584808573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71585857092 and 71585857101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71585857249) 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, 11930976189 + ... + 11930976194.

It is an arithmetic number, because the mean of its divisors is an integer number (23861952384).

Almost surely, 2^71585857149 is an apocalyptic number.

It is an amenable number.

71585857149 is a deficient number, since it is larger than the sum of its proper divisors (23861952387).

71585857149 is a wasteful number, since it uses less digits than its factorization.

71585857149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23861952386.

The product of its digits is 14112000, while the sum is 60.

The spelling of 71585857149 in words is "seventy-one billion, five hundred eighty-five million, eight hundred fifty-seven thousand, one hundred forty-nine".