61584547791 has 32 divisors (see below), whose sum is σ = 93117472000. Its totient is φ = 35890345728.

The previous prime is 61584547789. The next prime is 61584547807. The reversal of 61584547791 is 19774548516.

It is not a de Polignac number, because 61584547791 - 2¹ = 61584547789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61584507791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2223315 + ... + 2250843.

It is an arithmetic number, because the mean of its divisors is an integer number (2909921000).

Almost surely, 2^61584547791 is an apocalyptic number.

61584547791 is a deficient number, since it is larger than the sum of its proper divisors (31532924209).

61584547791 is a wasteful number, since it uses less digits than its factorization.

61584547791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30583.

The product of its digits is 8467200, while the sum is 57.

The spelling of 61584547791 in words is "sixty-one billion, five hundred eighty-four million, five hundred forty-seven thousand, seven hundred ninety-one".