61861870873 has 4 divisors (see below), whose sum is σ = 67485677328. Its totient is φ = 56238064420.

The previous prime is 61861870849. The next prime is 61861870907. The reversal of 61861870873 is 37807816816.

61861870873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61861870873 - 2¹⁷ = 61861739801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61861870813) 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, 2811903211 + ... + 2811903232.

It is an arithmetic number, because the mean of its divisors is an integer number (16871419332).

Almost surely, 2^61861870873 is an apocalyptic number.

It is an amenable number.

61861870873 is a deficient number, since it is larger than the sum of its proper divisors (5623806455).

61861870873 is a wasteful number, since it uses less digits than its factorization.

61861870873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623806454.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 61861870873 in words is "sixty-one billion, eight hundred sixty-one million, eight hundred seventy thousand, eight hundred seventy-three".