261553200137634 has 16 divisors (see below), whose sum is σ = 523301808002688. Its totient is φ = 87151832091312.

The previous prime is 261553200137633. The next prime is 261553200137689. The reversal of 261553200137634 is 436731002355162.

261553200137634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261553200137633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8141971242 + ... + 8142003365.

It is an arithmetic number, because the mean of its divisors is an integer number (32706363000168).

Almost surely, 2^{261553200137634} is an apocalyptic number.

261553200137634 is an abundant number, since it is smaller than the sum of its proper divisors (261748607865054).

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

261553200137634 is a wasteful number, since it uses less digits than its factorization.

261553200137634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16283977289.

The product of its (nonzero) digits is 2721600, while the sum is 48.

The spelling of 261553200137634 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, two hundred million, one hundred thirty-seven thousand, six hundred thirty-four".