261561755451076 has 48 divisors (see below), whose sum is σ = 461953508184000. Its totient is φ = 129575900869632.

The previous prime is 261561755451053. The next prime is 261561755451077. The reversal of 261561755451076 is 670154557165162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261561755451077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26857142215 + ... + 26857151953.

It is an arithmetic number, because the mean of its divisors is an integer number (9624031420500).

Almost surely, 2^{261561755451076} is an apocalyptic number.

It is an amenable number.

261561755451076 is a deficient number, since it is larger than the sum of its proper divisors (200391752732924).

261561755451076 is a wasteful number, since it uses less digits than its factorization.

261561755451076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25588 (or 25586 counting only the distinct ones).

The product of its (nonzero) digits is 52920000, while the sum is 61.

The spelling of 261561755451076 in words is "two hundred sixty-one trillion, five hundred sixty-one billion, seven hundred fifty-five million, four hundred fifty-one thousand, seventy-six".