61475777227 has 2 divisors, whose sum is σ = 61475777228. Its totient is φ = 61475777226.

The previous prime is 61475777131. The next prime is 61475777249. The reversal of 61475777227 is 72277757416.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61475777227 - 2¹⁹ = 61475252939 is a prime.

It is not a weakly prime, because it can be changed into another prime (61475777257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30737888613 + 30737888614.

It is an arithmetic number, because the mean of its divisors is an integer number (30737888614).

Almost surely, 2^61475777227 is an apocalyptic number.

61475777227 is a deficient number, since it is larger than the sum of its proper divisors (1).

61475777227 is an equidigital number, since it uses as much as digits as its factorization.

61475777227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8067360, while the sum is 55.

The spelling of 61475777227 in words is "sixty-one billion, four hundred seventy-five million, seven hundred seventy-seven thousand, two hundred twenty-seven".