61475777131 has 2 divisors, whose sum is σ = 61475777132. Its totient is φ = 61475777130.

The previous prime is 61475777081. The next prime is 61475777227. The reversal of 61475777131 is 13177757416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61475777131 - 2¹¹ = 61475775083 is a prime.

It is a super-2 number, since 2×61475777131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61475757131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30737888565 + 30737888566.

It is an arithmetic number, because the mean of its divisors is an integer number (30737888566).

Almost surely, 2^61475777131 is an apocalyptic number.

61475777131 is a deficient number, since it is larger than the sum of its proper divisors (1).

61475777131 is an equidigital number, since it uses as much as digits as its factorization.

61475777131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864360, while the sum is 49.

The spelling of 61475777131 in words is "sixty-one billion, four hundred seventy-five million, seven hundred seventy-seven thousand, one hundred thirty-one".