61091735525 has 6 divisors (see below), whose sum is σ = 75753752082. Its totient is φ = 48873388400.

The previous prime is 61091735491. The next prime is 61091735647. The reversal of 61091735525 is 52553719016.

It can be written as a sum of positive squares in 3 ways, for example, as 486158401 + 60605577124 = 22049^2 + 246182^2 .

It is not a de Polignac number, because 61091735525 - 2⁶ = 61091735461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1221834686 + ... + 1221834735.

It is an arithmetic number, because the mean of its divisors is an integer number (12625625347).

Almost surely, 2^61091735525 is an apocalyptic number.

It is an amenable number.

61091735525 is a deficient number, since it is larger than the sum of its proper divisors (14662016557).

61091735525 is a wasteful number, since it uses less digits than its factorization.

61091735525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443669431 (or 2443669426 counting only the distinct ones).

The product of its (nonzero) digits is 283500, while the sum is 44.

The spelling of 61091735525 in words is "sixty-one billion, ninety-one million, seven hundred thirty-five thousand, five hundred twenty-five".