61407756247 has 2 divisors, whose sum is σ = 61407756248. Its totient is φ = 61407756246.

The previous prime is 61407756239. The next prime is 61407756251. The reversal of 61407756247 is 74265770416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61407756247 - 2³ = 61407756239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61407756247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61407756227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30703878123 + 30703878124.

It is an arithmetic number, because the mean of its divisors is an integer number (30703878124).

Almost surely, 2^61407756247 is an apocalyptic number.

61407756247 is a deficient number, since it is larger than the sum of its proper divisors (1).

61407756247 is an equidigital number, since it uses as much as digits as its factorization.

61407756247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 61407756247 in words is "sixty-one billion, four hundred seven million, seven hundred fifty-six thousand, two hundred forty-seven".