61790672261 has 2 divisors, whose sum is σ = 61790672262. Its totient is φ = 61790672260.

The previous prime is 61790672239. The next prime is 61790672267. The reversal of 61790672261 is 16227609716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40326664225 + 21464008036 = 200815^2 + 146506^2 .

It is a cyclic number.

It is not a de Polignac number, because 61790672261 - 2¹⁸ = 61790410117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61790672267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30895336130 + 30895336131.

It is an arithmetic number, because the mean of its divisors is an integer number (30895336131).

Almost surely, 2^61790672261 is an apocalyptic number.

It is an amenable number.

61790672261 is a deficient number, since it is larger than the sum of its proper divisors (1).

61790672261 is an equidigital number, since it uses as much as digits as its factorization.

61790672261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 61790672261 in words is "sixty-one billion, seven hundred ninety million, six hundred seventy-two thousand, two hundred sixty-one".