61578650447 has 2 divisors, whose sum is σ = 61578650448. Its totient is φ = 61578650446.

The previous prime is 61578650407. The next prime is 61578650479. The reversal of 61578650447 is 74405687516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61578650447 - 2¹⁰ = 61578649423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61578650407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30789325223 + 30789325224.

It is an arithmetic number, because the mean of its divisors is an integer number (30789325224).

Almost surely, 2^61578650447 is an apocalyptic number.

61578650447 is a deficient number, since it is larger than the sum of its proper divisors (1).

61578650447 is an equidigital number, since it uses as much as digits as its factorization.

61578650447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 61578650447 in words is "sixty-one billion, five hundred seventy-eight million, six hundred fifty thousand, four hundred forty-seven".