61581093843 has 16 divisors (see below), whose sum is σ = 84716305920. Its totient is φ = 39769582944.

The previous prime is 61581093841. The next prime is 61581093883. The reversal of 61581093843 is 34839018516.

It is not a de Polignac number, because 61581093843 - 2¹ = 61581093841 is a prime.

It is a super-2 number, since 2×61581093843² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61581093792 and 61581093801.

It is not an unprimeable number, because it can be changed into a prime (61581093841) 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, 2438721 + ... + 2463842.

It is an arithmetic number, because the mean of its divisors is an integer number (5294769120).

Almost surely, 2^61581093843 is an apocalyptic number.

61581093843 is a deficient number, since it is larger than the sum of its proper divisors (23135212077).

61581093843 is a wasteful number, since it uses less digits than its factorization.

61581093843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4902698.

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 61581093843 in words is "sixty-one billion, five hundred eighty-one million, ninety-three thousand, eight hundred forty-three".