61574178541 has 4 divisors (see below), whose sum is σ = 64814924800. Its totient is φ = 58333432284.

The previous prime is 61574178433. The next prime is 61574178607. The reversal of 61574178541 is 14587147516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61574178541 - 2²⁹ = 61037307629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61574178241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620373101 + ... + 1620373138.

It is an arithmetic number, because the mean of its divisors is an integer number (16203731200).

Almost surely, 2^61574178541 is an apocalyptic number.

It is an amenable number.

61574178541 is a deficient number, since it is larger than the sum of its proper divisors (3240746259).

61574178541 is a wasteful number, since it uses less digits than its factorization.

61574178541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3240746258.

The product of its digits is 940800, while the sum is 49.

The spelling of 61574178541 in words is "sixty-one billion, five hundred seventy-four million, one hundred seventy-eight thousand, five hundred forty-one".