61861473449 has 2 divisors, whose sum is σ = 61861473450. Its totient is φ = 61861473448.

The previous prime is 61861473413. The next prime is 61861473469. The reversal of 61861473449 is 94437416816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37910815849 + 23950657600 = 194707^2 + 154760^2 .

It is a cyclic number.

It is not a de Polignac number, because 61861473449 - 2¹² = 61861469353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61861473449.

It is not a weakly prime, because it can be changed into another prime (61861473469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30930736724 + 30930736725.

It is an arithmetic number, because the mean of its divisors is an integer number (30930736725).

Almost surely, 2^61861473449 is an apocalyptic number.

It is an amenable number.

61861473449 is a deficient number, since it is larger than the sum of its proper divisors (1).

61861473449 is an equidigital number, since it uses as much as digits as its factorization.

61861473449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 53.

The spelling of 61861473449 in words is "sixty-one billion, eight hundred sixty-one million, four hundred seventy-three thousand, four hundred forty-nine".