61479398381 has 2 divisors, whose sum is σ = 61479398382. Its totient is φ = 61479398380.

The previous prime is 61479398341. The next prime is 61479398399. The reversal of 61479398381 is 18389397416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45712578025 + 15766820356 = 213805^2 + 125566^2 .

It is a cyclic number.

It is not a de Polignac number, because 61479398381 - 2⁶ = 61479398317 is a prime.

It is a super-2 number, since 2×61479398381² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61479398381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61479398311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30739699190 + 30739699191.

It is an arithmetic number, because the mean of its divisors is an integer number (30739699191).

Almost surely, 2^61479398381 is an apocalyptic number.

It is an amenable number.

61479398381 is a deficient number, since it is larger than the sum of its proper divisors (1).

61479398381 is an equidigital number, since it uses as much as digits as its factorization.

61479398381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 59.

The spelling of 61479398381 in words is "sixty-one billion, four hundred seventy-nine million, three hundred ninety-eight thousand, three hundred eighty-one".