1220417792687 has 2 divisors, whose sum is σ = 1220417792688. Its totient is φ = 1220417792686.

The previous prime is 1220417792681. The next prime is 1220417792723. The reversal of 1220417792687 is 7862977140221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220417792687 - 2⁸ = 1220417792431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220417792681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610208896343 + 610208896344.

It is an arithmetic number, because the mean of its divisors is an integer number (610208896344).

Almost surely, 2^{1220417792687} is an apocalyptic number.

1220417792687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220417792687 is an equidigital number, since it uses as much as digits as its factorization.

1220417792687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 1220417792687 in words is "one trillion, two hundred twenty billion, four hundred seventeen million, seven hundred ninety-two thousand, six hundred eighty-seven".