1420766257681 has 9 divisors (see below), whose sum is σ = 1423775155323. Its totient is φ = 1417763712960.

The previous prime is 1420766257657. The next prime is 1420766257697. The reversal of 1420766257681 is 1867526670241.

The square root of 1420766257681 is 1191959.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 684327672081 + 736438585600 = 827241^2 + 858160^2 .

It is not a de Polignac number, because 1420766257681 - 2¹¹ = 1420766255633 is a prime.

It is a super-2 number, since 2×1420766257681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1420766257621) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 752125185 + ... + 752127073.

Almost surely, 2^{1420766257681} is an apocalyptic number.

1420766257681 is the 1191959-th square number.

1420766257681 is the 595980-th centered octagonal number.

It is an amenable number.

1420766257681 is a deficient number, since it is larger than the sum of its proper divisors (3008897642).

1420766257681 is an frugal number, since it uses more digits than its factorization.

1420766257681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040 (or 2520 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 1420766257681 in words is "one trillion, four hundred twenty billion, seven hundred sixty-six million, two hundred fifty-seven thousand, six hundred eighty-one".