61473229681 has 2 divisors, whose sum is σ = 61473229682. Its totient is φ = 61473229680.

The previous prime is 61473229663. The next prime is 61473229687. The reversal of 61473229681 is 18692237416.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48911303281 + 12561926400 = 221159^2 + 112080^2 .

It is a cyclic number.

It is not a de Polignac number, because 61473229681 - 2¹³ = 61473221489 is a prime.

It is a super-2 number, since 2×61473229681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61473229687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30736614840 + 30736614841.

It is an arithmetic number, because the mean of its divisors is an integer number (30736614841).

Almost surely, 2^61473229681 is an apocalyptic number.

It is an amenable number.

61473229681 is a deficient number, since it is larger than the sum of its proper divisors (1).

61473229681 is an equidigital number, since it uses as much as digits as its factorization.

61473229681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The spelling of 61473229681 in words is "sixty-one billion, four hundred seventy-three million, two hundred twenty-nine thousand, six hundred eighty-one".