271961257638 has 128 divisors (see below), whose sum is σ = 683404001280. Its totient is φ = 70349938560.

The previous prime is 271961257621. The next prime is 271961257669. The reversal of 271961257638 is 836752169172.

It is a super-2 number, since 2×271961257638² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22587756 + ... + 22599792.

It is an arithmetic number, because the mean of its divisors is an integer number (5339093760).

Almost surely, 2^271961257638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 271961257638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341702000640).

271961257638 is an abundant number, since it is smaller than the sum of its proper divisors (411442743642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

271961257638 is a wasteful number, since it uses less digits than its factorization.

271961257638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13322.

The product of its digits is 7620480, while the sum is 57.

The spelling of 271961257638 in words is "two hundred seventy-one billion, nine hundred sixty-one million, two hundred fifty-seven thousand, six hundred thirty-eight".