261427687938 has 12 divisors (see below), whose sum is σ = 566426657238. Its totient is φ = 87142562640.

The previous prime is 261427687933. The next prime is 261427687957. The reversal of 261427687938 is 839786724162.

261427687938 is a `hidden beast` number, since 2 + 61 + 427 + 68 + 7 + 93 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 235849123449 + 25578564489 = 485643^2 + 159933^2 .

It is a super-3 number, since 3×261427687938³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (261427687931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7261880203 + ... + 7261880238.

Almost surely, 2^261427687938 is an apocalyptic number.

261427687938 is an abundant number, since it is smaller than the sum of its proper divisors (304998969300).

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

261427687938 is a wasteful number, since it uses less digits than its factorization.

261427687938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14523760449 (or 14523760446 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 261427687938 in words is "two hundred sixty-one billion, four hundred twenty-seven million, six hundred eighty-seven thousand, nine hundred thirty-eight".