8661485761501 has 2 divisors, whose sum is σ = 8661485761502. Its totient is φ = 8661485761500.

The previous prime is 8661485761349. The next prime is 8661485761507. The reversal of 8661485761501 is 1051675841668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4729315740601 + 3932170020900 = 2174699^2 + 1982970^2 .

It is a cyclic number.

It is not a de Polignac number, because 8661485761501 - 2¹¹ = 8661485759453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8661485761507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4330742880750 + 4330742880751.

It is an arithmetic number, because the mean of its divisors is an integer number (4330742880751).

Almost surely, 2^{8661485761501} is an apocalyptic number.

It is an amenable number.

8661485761501 is a deficient number, since it is larger than the sum of its proper divisors (1).

8661485761501 is an equidigital number, since it uses as much as digits as its factorization.

8661485761501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9676800, while the sum is 58.

The spelling of 8661485761501 in words is "eight trillion, six hundred sixty-one billion, four hundred eighty-five million, seven hundred sixty-one thousand, five hundred one".