261406696988 has 12 divisors (see below), whose sum is σ = 457466113272. Its totient is φ = 130702093200.

The previous prime is 261406696987. The next prime is 261406697003. The reversal of 261406696988 is 889696604162.

It is a super-2 number, since 2×261406696988² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261406696987) 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, 279263 + ... + 775113.

It is an arithmetic number, because the mean of its divisors is an integer number (38122176106).

Almost surely, 2^261406696988 is an apocalyptic number.

It is an amenable number.

261406696988 is a deficient number, since it is larger than the sum of its proper divisors (196059416284).

261406696988 is a wasteful number, since it uses less digits than its factorization.

261406696988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627652 (or 627650 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 65.

The spelling of 261406696988 in words is "two hundred sixty-one billion, four hundred six million, six hundred ninety-six thousand, nine hundred eighty-eight".