61403634440261 has 4 divisors (see below), whose sum is σ = 61403677396800. Its totient is φ = 61403591483724.

The previous prime is 61403634440227. The next prime is 61403634440287. The reversal of 61403634440261 is 16204443630416.

61403634440261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61403634440261 - 2²² = 61403630245957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61403634446261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19257581 + ... + 22218498.

It is an arithmetic number, because the mean of its divisors is an integer number (15350919349200).

Almost surely, 2^{61403634440261} is an apocalyptic number.

It is an amenable number.

61403634440261 is a deficient number, since it is larger than the sum of its proper divisors (42956539).

61403634440261 is a wasteful number, since it uses less digits than its factorization.

61403634440261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42956538.

The product of its (nonzero) digits is 995328, while the sum is 44.

The spelling of 61403634440261 in words is "sixty-one trillion, four hundred three billion, six hundred thirty-four million, four hundred forty thousand, two hundred sixty-one".