61525550262661 has 4 divisors (see below), whose sum is σ = 61549132308300. Its totient is φ = 61501968217024.

The previous prime is 61525550262647. The next prime is 61525550262691. The reversal of 61525550262661 is 16626205552516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41826874716900 + 19698675545761 = 6467370^2 + 4438319^2 .

It is a cyclic number.

It is not a de Polignac number, because 61525550262661 - 2¹¹ = 61525550260613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61525550262599 and 61525550262608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61525550262691) 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, 11791018906 + ... + 11791024123.

It is an arithmetic number, because the mean of its divisors is an integer number (15387283077075).

Almost surely, 2^{61525550262661} is an apocalyptic number.

It is an amenable number.

61525550262661 is a deficient number, since it is larger than the sum of its proper divisors (23582045639).

61525550262661 is a wasteful number, since it uses less digits than its factorization.

61525550262661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23582045638.

The product of its (nonzero) digits is 6480000, while the sum is 52.

The spelling of 61525550262661 in words is "sixty-one trillion, five hundred twenty-five billion, five hundred fifty million, two hundred sixty-two thousand, six hundred sixty-one".