671553181257 has 16 divisors (see below), whose sum is σ = 1056329428992. Its totient is φ = 371365814160.

The previous prime is 671553181217. The next prime is 671553181331. The reversal of 671553181257 is 752181355176.

It is not a de Polignac number, because 671553181257 - 2¹⁵ = 671553148489 is a prime.

It is a super-2 number, since 2×671553181257² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671553181217) 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 15 ways as a sum of consecutive naturals, for example, 515785203 + ... + 515786504.

It is an arithmetic number, because the mean of its divisors is an integer number (66020589312).

Almost surely, 2^671553181257 is an apocalyptic number.

It is an amenable number.

671553181257 is a deficient number, since it is larger than the sum of its proper divisors (384776247735).

671553181257 is a wasteful number, since it uses less digits than its factorization.

671553181257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031571748.

The product of its digits is 1764000, while the sum is 51.

The spelling of 671553181257 in words is "six hundred seventy-one billion, five hundred fifty-three million, one hundred eighty-one thousand, two hundred fifty-seven".