61525111561 has 8 divisors (see below), whose sum is σ = 63196073280. Its totient is φ = 59854577328.

The previous prime is 61525111547. The next prime is 61525111577. The reversal of 61525111561 is 16511152516.

61525111561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61525111561 - 2⁷ = 61525111433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61525111541) 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, 196410 + ... + 402028.

It is an arithmetic number, because the mean of its divisors is an integer number (7899509160).

Almost surely, 2^61525111561 is an apocalyptic number.

It is an amenable number.

61525111561 is a deficient number, since it is larger than the sum of its proper divisors (1670961719).

61525111561 is a wasteful number, since it uses less digits than its factorization.

61525111561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213743.

The product of its digits is 9000, while the sum is 34.

The spelling of 61525111561 in words is "sixty-one billion, five hundred twenty-five million, one hundred eleven thousand, five hundred sixty-one".