61232751581 has 16 divisors (see below), whose sum is σ = 69427568640. Its totient is φ = 53697861360.

The previous prime is 61232751553. The next prime is 61232751589. The reversal of 61232751581 is 18515723216.

It is a happy number.

61232751581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61232751581 is a prime.

It is a super-2 number, since 2×61232751581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61232751589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2246465 + ... + 2273558.

It is an arithmetic number, because the mean of its divisors is an integer number (4339223040).

Almost surely, 2^61232751581 is an apocalyptic number.

It is an amenable number.

61232751581 is a deficient number, since it is larger than the sum of its proper divisors (8194817059).

61232751581 is a wasteful number, since it uses less digits than its factorization.

61232751581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4520096.

The product of its digits is 100800, while the sum is 41.

The spelling of 61232751581 in words is "sixty-one billion, two hundred thirty-two million, seven hundred fifty-one thousand, five hundred eighty-one".