261543072400126 has 16 divisors (see below), whose sum is σ = 428116790050560. Its totient is φ = 118845098885080.

The previous prime is 261543072400091. The next prime is 261543072400171. The reversal of 261543072400126 is 621004270345162.

It is a super-2 number, since 2×261543072400126² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1905721936 + ... + 1905859171.

It is an arithmetic number, because the mean of its divisors is an integer number (26757299378160).

Almost surely, 2^{261543072400126} is an apocalyptic number.

261543072400126 is a deficient number, since it is larger than the sum of its proper divisors (166573717650434).

261543072400126 is a wasteful number, since it uses less digits than its factorization.

261543072400126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3811584239.

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 261543072400126 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seventy-two million, four hundred thousand, one hundred twenty-six".