487661578237621 has 2 divisors, whose sum is σ = 487661578237622. Its totient is φ = 487661578237620.

The previous prime is 487661578237541. The next prime is 487661578237643. The reversal of 487661578237621 is 126732875166784.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245755348615396 + 241906229622225 = 15676586^2 + 15553335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-487661578237621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (487661578237661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 243830789118810 + 243830789118811.

It is an arithmetic number, because the mean of its divisors is an integer number (243830789118811).

Almost surely, 2^{487661578237621} is an apocalyptic number.

It is an amenable number.

487661578237621 is a deficient number, since it is larger than the sum of its proper divisors (1).

487661578237621 is an equidigital number, since it uses as much as digits as its factorization.

487661578237621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1137991680, while the sum is 73.

The spelling of 487661578237621 in words is "four hundred eighty-seven trillion, six hundred sixty-one billion, five hundred seventy-eight million, two hundred thirty-seven thousand, six hundred twenty-one".